1640147764 has 24 divisors (see below), whose sum is σ = 2943255168. Its totient is φ = 799258560.

The previous prime is 1640147749. The next prime is 1640147791. The reversal of 1640147764 is 4677410461.

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, 176359 + ... + 185425.

It is an arithmetic number, because the mean of its divisors is an integer number (122635632).

Almost surely, 2^1640147764 is an apocalyptic number.

It is an amenable number.

1640147764 is a deficient number, since it is larger than the sum of its proper divisors (1303107404).

1640147764 is a wasteful number, since it uses less digits than its factorization.

1640147764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10215 (or 10213 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 1640147764 is about 40498.7378074922. The cubic root of 1640147764 is about 1179.3091244508.

The spelling of 1640147764 in words is "one billion, six hundred forty million, one hundred forty-seven thousand, seven hundred sixty-four".