664625276 has 12 divisors (see below), whose sum is σ = 1329250608. Its totient is φ = 284839392.

The previous prime is 664625233. The next prime is 664625281. The reversal of 664625276 is 672526466.

664625276 is an admirable number.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 11868281 + ... + 11868336.

It is an arithmetic number, because the mean of its divisors is an integer number (110770884).

Almost surely, 2^664625276 is an apocalyptic number.

It is an amenable number.

664625276 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

664625276 is a wasteful number, since it uses less digits than its factorization.

664625276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23736628 (or 23736626 counting only the distinct ones).

The product of its digits is 725760, while the sum is 44.

The square root of 664625276 is about 25780.3273059129. The cubic root of 664625276 is about 872.6878935685.

The spelling of 664625276 in words is "six hundred sixty-four million, six hundred twenty-five thousand, two hundred seventy-six".