30157688 has 32 divisors (see below), whose sum is σ = 62339760. Its totient is φ = 13562880.

The previous prime is 30157681. The next prime is 30157703. The reversal of 30157688 is 88675103.

It is a super-2 number, since 2×30157688² = 1818972291010688, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30157681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6770 + ... + 10302.

Almost surely, 2^30157688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30157688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31169880).

30157688 is an abundant number, since it is smaller than the sum of its proper divisors (32182072).

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

30157688 is a wasteful number, since it uses less digits than its factorization.

30157688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3647 (or 3643 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 30157688 is about 5491.6015878794. The cubic root of 30157688 is about 311.2667142629.

The spelling of 30157688 in words is "thirty million, one hundred fifty-seven thousand, six hundred eighty-eight".