663624978 has 32 divisors (see below), whose sum is σ = 1374501312. Its totient is φ = 213470400.

The previous prime is 663624947. The next prime is 663625013. The reversal of 663624978 is 879426366.

It is a happy number.

It is a super-2 number, since 2×663624978² = 880796222851000968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 663624978.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2293 + ... + 36503.

It is an arithmetic number, because the mean of its divisors is an integer number (42953166).

Almost surely, 2^663624978 is an apocalyptic number.

663624978 is an abundant number, since it is smaller than the sum of its proper divisors (710876334).

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

663624978 is a wasteful number, since it uses less digits than its factorization.

663624978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34330.

The product of its digits is 2612736, while the sum is 51.

The square root of 663624978 is about 25760.9195876234. The cubic root of 663624978 is about 872.2498591363.

The spelling of 663624978 in words is "six hundred sixty-three million, six hundred twenty-four thousand, nine hundred seventy-eight".