664908532 has 12 divisors (see below), whose sum is σ = 1185544836. Its totient is φ = 326181440.

The previous prime is 664908523. The next prime is 664908547. The reversal of 664908532 is 235809466.

It can be written as a sum of positive squares in 2 ways, for example, as 416404836 + 248503696 = 20406^2 + 15764^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1567969 + ... + 1568392.

It is an arithmetic number, because the mean of its divisors is an integer number (98795403).

Almost surely, 2^664908532 is an apocalyptic number.

It is an amenable number.

664908532 is a deficient number, since it is larger than the sum of its proper divisors (520636304).

664908532 is a wasteful number, since it uses less digits than its factorization.

664908532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3136418 (or 3136416 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 664908532 is about 25785.8203670157. The cubic root of 664908532 is about 872.8118526284.

The spelling of 664908532 in words is "six hundred sixty-four million, nine hundred eight thousand, five hundred thirty-two".