1640764464 has 40 divisors (see below), whose sum is σ = 4240262832. Its totient is φ = 546712320.

The previous prime is 1640764439. The next prime is 1640764483. The reversal of 1640764464 is 4644670461.

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, 168694 + ... + 178154.

Almost surely, 2^1640764464 is an apocalyptic number.

It is an amenable number.

1640764464 is an abundant number, since it is smaller than the sum of its proper divisors (2599498368).

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

1640764464 is a wasteful number, since it uses less digits than its factorization.

1640764464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13085 (or 13079 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 42.

The square root of 1640764464 is about 40506.3509094562. The cubic root of 1640764464 is about 1179.4569137372.

The spelling of 1640764464 in words is "one billion, six hundred forty million, seven hundred sixty-four thousand, four hundred sixty-four".