864778680 has 96 divisors (see below), whose sum is σ = 2914657200. Its totient is φ = 230605056.

The previous prime is 864778669. The next prime is 864778699. The reversal of 864778680 is 86877468.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 34765 + ... + 54204.

Almost surely, 2^864778680 is an apocalyptic number.

It is an amenable number.

864778680 is an abundant number, since it is smaller than the sum of its proper divisors (2049878520).

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

864778680 is a wasteful number, since it uses less digits than its factorization.

864778680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88995 (or 88979 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 54.

The square root of 864778680 is about 29407.1195461235. The cubic root of 864778680 is about 952.7266743056.

The spelling of 864778680 in words is "eight hundred sixty-four million, seven hundred seventy-eight thousand, six hundred eighty".