664857722 has 16 divisors (see below), whose sum is σ = 1033929792. Its totient is φ = 320410080.

The previous prime is 664857719. The next prime is 664857737. The reversal of 664857722 is 227758466.

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, 42038 + ... + 55649.

It is an arithmetic number, because the mean of its divisors is an integer number (64620612).

Almost surely, 2^664857722 is an apocalyptic number.

664857722 is a deficient number, since it is larger than the sum of its proper divisors (369072070).

664857722 is a wasteful number, since it uses less digits than its factorization.

664857722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97813.

The product of its digits is 1128960, while the sum is 47.

The square root of 664857722 is about 25784.8351167891. The cubic root of 664857722 is about 872.7896196456.

The spelling of 664857722 in words is "six hundred sixty-four million, eight hundred fifty-seven thousand, seven hundred twenty-two".