664993770 has 32 divisors (see below), whose sum is σ = 1823983488. Its totient is φ = 151998528.

The previous prime is 664993729. The next prime is 664993781. The reversal of 664993770 is 77399466.

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, 1583109 + ... + 1583528.

It is an arithmetic number, because the mean of its divisors is an integer number (56999484).

Almost surely, 2^664993770 is an apocalyptic number.

664993770 is an abundant number, since it is smaller than the sum of its proper divisors (1158989718).

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

664993770 is a wasteful number, since it uses less digits than its factorization.

664993770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3166654.

The product of its (nonzero) digits is 1714608, while the sum is 51.

The square root of 664993770 is about 25787.4731216535. The cubic root of 664993770 is about 872.8491477621.

The spelling of 664993770 in words is "six hundred sixty-four million, nine hundred ninety-three thousand, seven hundred seventy".