864499720 has 128 divisors (see below), whose sum is σ = 2275257600. Its totient is φ = 289529856.

The previous prime is 864499711. The next prime is 864499739. The reversal of 864499720 is 27994468.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2815807 + ... + 2816113.

It is an arithmetic number, because the mean of its divisors is an integer number (17775450).

Almost surely, 2^864499720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 864499720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1137628800).

864499720 is an abundant number, since it is smaller than the sum of its proper divisors (1410757880).

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

864499720 is a wasteful number, since it uses less digits than its factorization.

864499720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527 (or 523 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 49.

The square root of 864499720 is about 29402.3760944588. The cubic root of 864499720 is about 952.6242198773.

It can be divided in two parts, 86449 and 9720, that added together give a palindrome (96169).

The spelling of 864499720 in words is "eight hundred sixty-four million, four hundred ninety-nine thousand, seven hundred twenty".