664478790 has 32 divisors (see below), whose sum is σ = 1595535840. Its totient is φ = 177106944.

The previous prime is 664478783. The next prime is 664478803. The reversal of 664478790 is 97874466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76552 + ... + 84788.

It is an arithmetic number, because the mean of its divisors is an integer number (49860495).

Almost surely, 2^664478790 is an apocalyptic number.

664478790 is an abundant number, since it is smaller than the sum of its proper divisors (931057050).

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

664478790 is a wasteful number, since it uses less digits than its factorization.

664478790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10936.

The product of its (nonzero) digits is 2032128, while the sum is 51.

The square root of 664478790 is about 25777.4861070664. The cubic root of 664478790 is about 872.6237742538.

The spelling of 664478790 in words is "six hundred sixty-four million, four hundred seventy-eight thousand, seven hundred ninety".