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BaseRepresentation
bin111001001110…
…0001110000000
32002110011021010
41302130032000
530140000000
62551000520
7512665362
oct162341600
962404233
1030000000
1115a30498
12a069140
1362a4ca4
143dacd32
152978d50
hex1c9c380

30000000 has 128 divisors (see below), whose sum is σ = 99609120. Its totient is φ = 8000000.

The previous prime is 29999999. The next prime is 30000001. The reversal of 30000000 is 3.

It is an interprime number because it is at equal distance from previous prime (29999999) and next prime (30000001).

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (3).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 30000000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30000001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5999998 + ... + 6000002.

Almost surely, 230000000 is an apocalyptic number.

30000000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49804560).

30000000 is an abundant number, since it is smaller than the sum of its proper divisors (69609120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30000000 is an frugal number, since it uses more digits than its factorization.

30000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52 (or 10 counting only the distinct ones).

The product of its (nonzero) digits is 3, while the sum is 3.

The square root of 30000000 is about 5477.2255750517. The cubic root of 30000000 is about 310.7232505954.

The spelling of 30000000 in words is "thirty million", and thus it is an aban number, an eban number, and an uban number.