1640645304 has 32 divisors (see below), whose sum is σ = 4243050000. Its totient is φ = 528023552.

The previous prime is 1640645297. The next prime is 1640645317. The reversal of 1640645304 is 4035460461.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1177929 + ... + 1179320.

Almost surely, 2^1640645304 is an apocalyptic number.

It is an amenable number.

1640645304 is an abundant number, since it is smaller than the sum of its proper divisors (2602404696).

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

1640645304 is a wasteful number, since it uses less digits than its factorization.

1640645304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357287 (or 2357283 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 1640645304 is about 40504.8800022911. The cubic root of 1640645304 is about 1179.4283604843.

The spelling of 1640645304 in words is "one billion, six hundred forty million, six hundred forty-five thousand, three hundred four".