864997680 has 40 divisors (see below), whose sum is σ = 2681493552. Its totient is φ = 230665984.

The previous prime is 864997613. The next prime is 864997687. The reversal of 864997680 is 86799468.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 864997680.

It is not an unprimeable number, because it can be changed into a prime (864997687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1801839 + ... + 1802318.

Almost surely, 2^864997680 is an apocalyptic number.

864997680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

864997680 is an abundant number, since it is smaller than the sum of its proper divisors (1816495872).

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

864997680 is a wasteful number, since it uses less digits than its factorization.

864997680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3604173 (or 3604167 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 57.

The square root of 864997680 is about 29410.8428984958. The cubic root of 864997680 is about 952.8070916178.

The spelling of 864997680 in words is "eight hundred sixty-four million, nine hundred ninety-seven thousand, six hundred eighty".