861247072 has 48 divisors (see below), whose sum is σ = 1970680320. Its totient is φ = 362844288.

The previous prime is 861247069. The next prime is 861247091. The reversal of 861247072 is 270742168.

It is a congruent number.

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, 19368 + ... + 45799.

It is an arithmetic number, because the mean of its divisors is an integer number (41055840).

Almost surely, 2^861247072 is an apocalyptic number.

It is an amenable number.

861247072 is an abundant number, since it is smaller than the sum of its proper divisors (1109433248).

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

861247072 is a wasteful number, since it uses less digits than its factorization.

861247072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65243 (or 65235 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 861247072 is about 29347.0112958713. The cubic root of 861247072 is about 951.4279806358.

The spelling of 861247072 in words is "eight hundred sixty-one million, two hundred forty-seven thousand, seventy-two".