664062720 has 72 divisors (see below), whose sum is σ = 2120862576. Its totient is φ = 177082368.

The previous prime is 664062719. The next prime is 664062757. The reversal of 664062720 is 27260466.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82627 + ... + 90306.

Almost surely, 2^664062720 is an apocalyptic number.

664062720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664062720 is an abundant number, since it is smaller than the sum of its proper divisors (1456799856).

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

664062720 is a wasteful number, since it uses less digits than its factorization.

664062720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172957 (or 172943 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 664062720 is about 25769.4144287370. The cubic root of 664062720 is about 872.4416022085.

The spelling of 664062720 in words is "six hundred sixty-four million, sixty-two thousand, seven hundred twenty".