30918868 has 6 divisors (see below), whose sum is σ = 54108026. Its totient is φ = 15459432.

The previous prime is 30918863. The next prime is 30918913. The reversal of 30918868 is 86881903.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 30603024 + 315844 = 5532^2 + 562^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30918863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3864855 + ... + 3864862.

Almost surely, 2^30918868 is an apocalyptic number.

It is an amenable number.

30918868 is a deficient number, since it is larger than the sum of its proper divisors (23189158).

30918868 is a wasteful number, since it uses less digits than its factorization.

30918868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7729721 (or 7729719 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 30918868 is about 5560.4737208263. The cubic root of 30918868 is about 313.8637758185.

The spelling of 30918868 in words is "thirty million, nine hundred eighteen thousand, eight hundred sixty-eight".