861253320 has 64 divisors (see below), whose sum is σ = 2735752320. Its totient is φ = 216157184.

The previous prime is 861253279. The next prime is 861253373. The reversal of 861253320 is 23352168.

It is a super-2 number, since 2×861253320² = 1483514562422044800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 209052 + ... + 213131.

It is an arithmetic number, because the mean of its divisors is an integer number (42746130).

Almost surely, 2^861253320 is an apocalyptic number.

It is an amenable number.

861253320 is an abundant number, since it is smaller than the sum of its proper divisors (1874499000).

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

861253320 is a wasteful number, since it uses less digits than its factorization.

861253320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422214 (or 422210 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 861253320 is about 29347.1177460411. The cubic root of 861253320 is about 951.4302813723.

The spelling of 861253320 in words is "eight hundred sixty-one million, two hundred fifty-three thousand, three hundred twenty".