864523720 has 32 divisors (see below), whose sum is σ = 1977072120. Its totient is φ = 340139520.

The previous prime is 864523717. The next prime is 864523739. The reversal of 864523720 is 27325468.

864523720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 386751556 + 477772164 = 19666^2 + 21858^2 .

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 864523720.

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, 174717 + ... + 179596.

Almost surely, 2^864523720 is an apocalyptic number.

It is an amenable number.

864523720 is an abundant number, since it is smaller than the sum of its proper divisors (1112548400).

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

864523720 is a wasteful number, since it uses less digits than its factorization.

864523720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354385 (or 354381 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 864523720 is about 29402.7842219066. The cubic root of 864523720 is about 952.6330352917.

The spelling of 864523720 in words is "eight hundred sixty-four million, five hundred twenty-three thousand, seven hundred twenty".