664160440 has 32 divisors (see below), whose sum is σ = 1495237680. Its totient is φ = 265508352.

The previous prime is 664160417. The next prime is 664160477. The reversal of 664160440 is 44061466.

It is a super-2 number, since 2×664160440² = 882218180121987200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84352 + ... + 91888.

Almost surely, 2^664160440 is an apocalyptic number.

It is an amenable number.

664160440 is an abundant number, since it is smaller than the sum of its proper divisors (831077240).

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

664160440 is a wasteful number, since it uses less digits than its factorization.

664160440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9751 (or 9747 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 664160440 is about 25771.3104051773. The cubic root of 664160440 is about 872.4843947587.

It can be divided in two parts, 6641 and 60440, that added together give a square (67081 = 259²).

The spelling of 664160440 in words is "six hundred sixty-four million, one hundred sixty thousand, four hundred forty".