864365721500 has 48 divisors (see below), whose sum is σ = 1888469462880. Its totient is φ = 345619049600.

The previous prime is 864365721493. The next prime is 864365721539. The reversal of 864365721500 is 5127563468.

It is a congruent number.

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, 1047767 + ... + 1681233.

It is an arithmetic number, because the mean of its divisors is an integer number (39343113810).

Almost surely, 2^864365721500 is an apocalyptic number.

It is an amenable number.

864365721500 is an abundant number, since it is smaller than the sum of its proper divisors (1024103741380).

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

864365721500 is a wasteful number, since it uses less digits than its factorization.

864365721500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636215 (or 636203 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 864365721500 in words is "eight hundred sixty-four billion, three hundred sixty-five million, seven hundred twenty-one thousand, five hundred".