861897320 has 16 divisors (see below), whose sum is σ = 1939269060. Its totient is φ = 344758912.

The previous prime is 861897301. The next prime is 861897353. The reversal of 861897320 is 23798168.

861897320 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 2 ways, for example, as 789272836 + 72624484 = 28094^2 + 8522^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10773677 + ... + 10773756.

Almost surely, 2^861897320 is an apocalyptic number.

It is an amenable number.

861897320 is an abundant number, since it is smaller than the sum of its proper divisors (1077371740).

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

861897320 is a wasteful number, since it uses less digits than its factorization.

861897320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21547444 (or 21547440 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 861897320 is about 29358.0878123900. The cubic root of 861897320 is about 951.6673654876.

The spelling of 861897320 in words is "eight hundred sixty-one million, eight hundred ninety-seven thousand, three hundred twenty".