864905657 has 16 divisors (see below), whose sum is σ = 1115510400. Its totient is φ = 650711040.

The previous prime is 864905581. The next prime is 864905659. The reversal of 864905657 is 756509468.

It is not a de Polignac number, because 864905657 - 2¹⁰ = 864904633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864905659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191432 + ... + 195897.

It is an arithmetic number, because the mean of its divisors is an integer number (69719400).

Almost surely, 2^864905657 is an apocalyptic number.

It is an amenable number.

864905657 is a deficient number, since it is larger than the sum of its proper divisors (250604743).

864905657 is a wasteful number, since it uses less digits than its factorization.

864905657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387376.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The square root of 864905657 is about 29409.2784168534. The cubic root of 864905657 is about 952.7733022106.

The spelling of 864905657 in words is "eight hundred sixty-four million, nine hundred five thousand, six hundred fifty-seven".