30978988 has 12 divisors (see below), whose sum is σ = 54609912. Its totient is φ = 15376160.

The previous prime is 30978979. The next prime is 30979019. The reversal of 30978988 is 88987903.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27718 + ... + 28813.

It is an arithmetic number, because the mean of its divisors is an integer number (4550826).

Almost surely, 2^30978988 is an apocalyptic number.

It is an amenable number.

30978988 is a deficient number, since it is larger than the sum of its proper divisors (23630924).

30978988 is a wasteful number, since it uses less digits than its factorization.

30978988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56672 (or 56670 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 30978988 is about 5565.8771096746. The cubic root of 30978988 is about 314.0670742616.

It can be divided in two parts, 309 and 78988, that added together give a palindrome (79297).

The spelling of 30978988 in words is "thirty million, nine hundred seventy-eight thousand, nine hundred eighty-eight".