30685688 has 32 divisors (see below), whose sum is σ = 63072000. Its totient is φ = 13880160.

The previous prime is 30685679. The next prime is 30685709. The reversal of 30685688 is 88658603.

It is a super-2 number, since 2×30685688² = 1883222896066688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20303 + ... + 21761.

It is an arithmetic number, because the mean of its divisors is an integer number (1971000).

Almost surely, 2^30685688 is an apocalyptic number.

It is an amenable number.

30685688 is an abundant number, since it is smaller than the sum of its proper divisors (32386312).

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

30685688 is a wasteful number, since it uses less digits than its factorization.

30685688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715 (or 1711 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 30685688 is about 5539.4664002952. The cubic root of 30685688 is about 313.0727646089.

The spelling of 30685688 in words is "thirty million, six hundred eighty-five thousand, six hundred eighty-eight".