864899555 has 16 divisors (see below), whose sum is σ = 1125230400. Its totient is φ = 634401408.

The previous prime is 864899543. The next prime is 864899611. The reversal of 864899555 is 555998468.

It is a cyclic number.

It is not a de Polignac number, because 864899555 - 2¹⁴ = 864883171 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 864899494 and 864899503.

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, 34967 + ... + 54336.

It is an arithmetic number, because the mean of its divisors is an integer number (70326900).

Almost surely, 2^864899555 is an apocalyptic number.

864899555 is a deficient number, since it is larger than the sum of its proper divisors (260330845).

864899555 is a wasteful number, since it uses less digits than its factorization.

864899555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89470.

The product of its digits is 15552000, while the sum is 59.

The square root of 864899555 is about 29409.1746739007. The cubic root of 864899555 is about 952.7710615669.

The spelling of 864899555 in words is "eight hundred sixty-four million, eight hundred ninety-nine thousand, five hundred fifty-five".