664732371 has 8 divisors (see below), whose sum is σ = 888088000. Its totient is φ = 442265832.

The previous prime is 664732319. The next prime is 664732381. The reversal of 664732371 is 173237466.

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

It is not a de Polignac number, because 664732371 - 2¹⁷ = 664601299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664732381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220525 + ... + 223518.

It is an arithmetic number, because the mean of its divisors is an integer number (111011000).

Almost surely, 2^664732371 is an apocalyptic number.

664732371 is a deficient number, since it is larger than the sum of its proper divisors (223355629).

664732371 is a wasteful number, since it uses less digits than its factorization.

664732371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444545.

The product of its digits is 127008, while the sum is 39.

The square root of 664732371 is about 25782.4042905234. The cubic root of 664732371 is about 872.7347648376.

The spelling of 664732371 in words is "six hundred sixty-four million, seven hundred thirty-two thousand, three hundred seventy-one".