30639768 has 16 divisors (see below), whose sum is σ = 76599480. Its totient is φ = 10213248.

The previous prime is 30639767. The next prime is 30639773. The reversal of 30639768 is 86793603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30639767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 638305 + ... + 638352.

Almost surely, 2^30639768 is an apocalyptic number.

It is an amenable number.

30639768 is an abundant number, since it is smaller than the sum of its proper divisors (45959712).

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

30639768 is a wasteful number, since it uses less digits than its factorization.

30639768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276666 (or 1276662 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 30639768 is about 5535.3200449477. The cubic root of 30639768 is about 312.9165193639.

The spelling of 30639768 in words is "thirty million, six hundred thirty-nine thousand, seven hundred sixty-eight".