864257505 has 16 divisors (see below), whose sum is σ = 1396505664. Its totient is φ = 456372800.

The previous prime is 864257489. The next prime is 864257533. The reversal of 864257505 is 505752468.

It is not a de Polignac number, because 864257505 - 2⁴ = 864257489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283719 + ... + 286748.

It is an arithmetic number, because the mean of its divisors is an integer number (87281604).

Almost surely, 2^864257505 is an apocalyptic number.

It is an amenable number.

864257505 is a deficient number, since it is larger than the sum of its proper divisors (532248159).

864257505 is a wasteful number, since it uses less digits than its factorization.

864257505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570576.

The product of its (nonzero) digits is 336000, while the sum is 42.

The square root of 864257505 is about 29398.2568360779. The cubic root of 864257505 is about 952.5352430109.

The spelling of 864257505 in words is "eight hundred sixty-four million, two hundred fifty-seven thousand, five hundred five".