1640075664 has 40 divisors (see below), whose sum is σ = 4239853632. Its totient is φ = 546305920.

The previous prime is 1640075641. The next prime is 1640075699. The reversal of 1640075664 is 4665700461.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61222 + ... + 83834.

Almost surely, 2^1640075664 is an apocalyptic number.

It is an amenable number.

1640075664 is an abundant number, since it is smaller than the sum of its proper divisors (2599777968).

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

1640075664 is a wasteful number, since it uses less digits than its factorization.

1640075664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24135 (or 24129 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 1640075664 is about 40497.8476465108. The cubic root of 1640075664 is about 1179.2918436025.

The spelling of 1640075664 in words is "one billion, six hundred forty million, seventy-five thousand, six hundred sixty-four".