861239568 has 80 divisors (see below), whose sum is σ = 2546186240. Its totient is φ = 245731968.

The previous prime is 861239539. The next prime is 861239573. The reversal of 861239568 is 865932168.

It is a happy number.

It is a super-4 number, since 4×861239568⁴ (a number of 37 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 347871 + ... + 350337.

It is an arithmetic number, because the mean of its divisors is an integer number (31827328).

Almost surely, 2^861239568 is an apocalyptic number.

It is an amenable number.

861239568 is an abundant number, since it is smaller than the sum of its proper divisors (1684946672).

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

861239568 is a wasteful number, since it uses less digits than its factorization.

861239568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3524 (or 3518 counting only the distinct ones).

The product of its digits is 622080, while the sum is 48.

The square root of 861239568 is about 29346.8834461174. The cubic root of 861239568 is about 951.4252173806.

The spelling of 861239568 in words is "eight hundred sixty-one million, two hundred thirty-nine thousand, five hundred sixty-eight".