30978768 has 40 divisors (see below), whose sum is σ = 82196128. Its totient is φ = 10046592.

The previous prime is 30978767. The next prime is 30978799. The reversal of 30978768 is 86787903.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30978763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6946 + ... + 10497.

Almost surely, 2^30978768 is an apocalyptic number.

It is an amenable number.

30978768 is an abundant number, since it is smaller than the sum of its proper divisors (51217360).

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

30978768 is a wasteful number, since it uses less digits than its factorization.

30978768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17491 (or 17485 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 48.

The square root of 30978768 is about 5565.8573463573. The cubic root of 30978768 is about 314.0663308015.

The spelling of 30978768 in words is "thirty million, nine hundred seventy-eight thousand, seven hundred sixty-eight".