30789990 has 128 divisors (see below), whose sum is σ = 102435840. Its totient is φ = 6393600.

The previous prime is 30789989. The next prime is 30790003. The reversal of 30789990 is 9998703.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20050 + ... + 21530.

It is an arithmetic number, because the mean of its divisors is an integer number (800280).

Almost surely, 2^30789990 is an apocalyptic number.

30789990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 30789990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51217920).

30789990 is an abundant number, since it is smaller than the sum of its proper divisors (71645850).

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

30789990 is a wasteful number, since it uses less digits than its factorization.

30789990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515 (or 1509 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 30789990 is about 5548.8728585182. The cubic root of 30789990 is about 313.4270794892.

The spelling of 30789990 in words is "thirty million, seven hundred eighty-nine thousand, nine hundred ninety".