860509220 has 24 divisors (see below), whose sum is σ = 1823652600. Its totient is φ = 341044992.

The previous prime is 860509217. The next prime is 860509231. The reversal of 860509220 is 22905068.

It can be written as a sum of positive squares in 4 ways, for example, as 401521444 + 458987776 = 20038^2 + 21424^2 .

It is a super-2 number, since 2×860509220² = 1480952235410016800, which contains 22 as substring.

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, 195185 + ... + 199544.

It is an arithmetic number, because the mean of its divisors is an integer number (75985525).

Almost surely, 2^860509220 is an apocalyptic number.

It is an amenable number.

860509220 is an abundant number, since it is smaller than the sum of its proper divisors (963143380).

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

860509220 is a wasteful number, since it uses less digits than its factorization.

860509220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394847 (or 394845 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 860509220 is about 29334.4374413419. The cubic root of 860509220 is about 951.1561989237.

The spelling of 860509220 in words is "eight hundred sixty million, five hundred nine thousand, two hundred twenty".