664231040 has 64 divisors (see below), whose sum is σ = 1732302720. Its totient is φ = 241536000.

The previous prime is 664231039. The next prime is 664231049. The reversal of 664231040 is 40132466.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (664231049) 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, 40136 + ... + 54215.

It is an arithmetic number, because the mean of its divisors is an integer number (27067230).

Almost surely, 2^664231040 is an apocalyptic number.

It is an amenable number.

664231040 is an abundant number, since it is smaller than the sum of its proper divisors (1068071680).

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

664231040 is a wasteful number, since it uses less digits than its factorization.

664231040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94381 (or 94369 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 664231040 is about 25772.6801089836. The cubic root of 664231040 is about 872.5153085822.

The spelling of 664231040 in words is "six hundred sixty-four million, two hundred thirty-one thousand, forty".