664591794 has 8 divisors (see below), whose sum is σ = 1329183600. Its totient is φ = 221530596.

The previous prime is 664591787. The next prime is 664591799. The reversal of 664591794 is 497195466.

It is a sphenic number, since it is the product of 3 distinct primes.

664591794 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (664591799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55382644 + ... + 55382655.

It is an arithmetic number, because the mean of its divisors is an integer number (166147950).

Almost surely, 2^664591794 is an apocalyptic number.

664591794 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

664591794 is a wasteful number, since it uses less digits than its factorization.

664591794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110765304.

The product of its digits is 1632960, while the sum is 51.

The square root of 664591794 is about 25779.6779266150. The cubic root of 664591794 is about 872.6732387810.

The spelling of 664591794 in words is "six hundred sixty-four million, five hundred ninety-one thousand, seven hundred ninety-four".