861479656 has 16 divisors (see below), whose sum is σ = 1618121700. Its totient is φ = 429980544.

The previous prime is 861479639. The next prime is 861479657. The reversal of 861479656 is 656974168.

It can be written as a sum of positive squares in 2 ways, for example, as 850655556 + 10824100 = 29166^2 + 3290^2 .

It is not an unprimeable number, because it can be changed into a prime (861479657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90075 + ... + 99178.

Almost surely, 2^861479656 is an apocalyptic number.

It is an amenable number.

861479656 is a deficient number, since it is larger than the sum of its proper divisors (756642044).

861479656 is a wasteful number, since it uses less digits than its factorization.

861479656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189828 (or 189824 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 52.

The square root of 861479656 is about 29350.9736806124. The cubic root of 861479656 is about 951.5136188596.

The spelling of 861479656 in words is "eight hundred sixty-one million, four hundred seventy-nine thousand, six hundred fifty-six".