664271732 has 6 divisors (see below), whose sum is σ = 1162475538. Its totient is φ = 332135864.

The previous prime is 664271681. The next prime is 664271747. The reversal of 664271732 is 237172466.

It can be written as a sum of positive squares in only one way, i.e., 636351076 + 27920656 = 25226^2 + 5284^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83033963 + ... + 83033970.

It is an arithmetic number, because the mean of its divisors is an integer number (193745923).

Almost surely, 2^664271732 is an apocalyptic number.

It is an amenable number.

664271732 is a deficient number, since it is larger than the sum of its proper divisors (498203806).

664271732 is a wasteful number, since it uses less digits than its factorization.

664271732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166067937 (or 166067935 counting only the distinct ones).

The product of its digits is 84672, while the sum is 38.

The square root of 664271732 is about 25773.4695374915. The cubic root of 664271732 is about 872.5331255092.

The spelling of 664271732 in words is "six hundred sixty-four million, two hundred seventy-one thousand, seven hundred thirty-two".