864331855 has 8 divisors (see below), whose sum is σ = 1038079152. Its totient is φ = 690878208.

The previous prime is 864331847. The next prime is 864331873. The reversal of 864331855 is 558133468.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 864331855 - 2³ = 864331847 is a prime.

It is a super-3 number, since 3×864331855³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66882 + ... + 78751.

It is an arithmetic number, because the mean of its divisors is an integer number (129759894).

Almost surely, 2^864331855 is an apocalyptic number.

864331855 is a deficient number, since it is larger than the sum of its proper divisors (173747297).

864331855 is a wasteful number, since it uses less digits than its factorization.

864331855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146825.

The product of its digits is 345600, while the sum is 43.

The square root of 864331855 is about 29399.5213396409. The cubic root of 864331855 is about 952.5625570017.

It can be divided in two parts, 86433 and 1855, that added together give a palindrome (88288).

The spelling of 864331855 in words is "eight hundred sixty-four million, three hundred thirty-one thousand, eight hundred fifty-five".