30684540 has 24 divisors (see below), whose sum is σ = 85916880. Its totient is φ = 8182528.

The previous prime is 30684539. The next prime is 30684547. The reversal of 30684540 is 4548603.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 30684498 and 30684507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30684547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255645 + ... + 255764.

It is an arithmetic number, because the mean of its divisors is an integer number (3579870).

Almost surely, 2^30684540 is an apocalyptic number.

30684540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30684540 is an abundant number, since it is smaller than the sum of its proper divisors (55232340).

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

30684540 is a wasteful number, since it uses less digits than its factorization.

30684540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511421 (or 511419 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 30684540 is about 5539.3627792373. The cubic root of 30684540 is about 313.0688603782.

The spelling of 30684540 in words is "thirty million, six hundred eighty-four thousand, five hundred forty".