1250640864 has 96 divisors (see below), whose sum is σ = 3979342080. Its totient is φ = 378979200.

The previous prime is 1250640851. The next prime is 1250640869. The reversal of 1250640864 is 4680460521.

1250640864 is a `hidden beast` number, since 1 + 2 + 5 + 0 + 640 + 8 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1250640869) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 56292 + ... + 75299.

It is an arithmetic number, because the mean of its divisors is an integer number (41451480).

Almost surely, 2^1250640864 is an apocalyptic number.

It is an amenable number.

1250640864 is an abundant number, since it is smaller than the sum of its proper divisors (2728701216).

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

1250640864 is a wasteful number, since it uses less digits than its factorization.

1250640864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131621 (or 131607 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 1250640864 is about 35364.4010835756. The cubic root of 1250640864 is about 1077.4014068483.

The spelling of 1250640864 in words is "one billion, two hundred fifty million, six hundred forty thousand, eight hundred sixty-four".