865223860 has 24 divisors (see below), whose sum is σ = 1828549800. Its totient is φ = 343883904.

The previous prime is 865223851. The next prime is 865223899. The reversal of 865223860 is 68322568.

It can be written as a sum of positive squares in 4 ways, for example, as 160427556 + 704796304 = 12666^2 + 26548^2 .

It is a super-2 number, since 2×865223860² = 1497224655826599200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134635 + ... + 140914.

It is an arithmetic number, because the mean of its divisors is an integer number (76189575).

Almost surely, 2^865223860 is an apocalyptic number.

It is an amenable number.

865223860 is an abundant number, since it is smaller than the sum of its proper divisors (963325940).

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

865223860 is a wasteful number, since it uses less digits than its factorization.

865223860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275715 (or 275713 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 865223860 is about 29414.6878276823. The cubic root of 865223860 is about 952.8901311959.

The spelling of 865223860 in words is "eight hundred sixty-five million, two hundred twenty-three thousand, eight hundred sixty".