664936370 has 32 divisors (see below), whose sum is σ = 1395792000. Its totient is φ = 227977008.

The previous prime is 664936343. The next prime is 664936373. The reversal of 664936370 is 73639466.

It is a super-2 number, since 2×664936370² = 884280752297553800, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664936373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93500 + ... + 100359.

It is an arithmetic number, because the mean of its divisors is an integer number (43618500).

Almost surely, 2^664936370 is an apocalyptic number.

664936370 is an abundant number, since it is smaller than the sum of its proper divisors (730855630).

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

664936370 is a wasteful number, since it uses less digits than its factorization.

664936370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193887 (or 193873 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 44.

The square root of 664936370 is about 25786.3601541590. The cubic root of 664936370 is about 872.8240332498.

The spelling of 664936370 in words is "six hundred sixty-four million, nine hundred thirty-six thousand, three hundred seventy".