861886272 has 56 divisors (see below), whose sum is σ = 2455830496. Its totient is φ = 265195008.

The previous prime is 861886271. The next prime is 861886279. The reversal of 861886272 is 272688168.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861886271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170158 + ... + 175149.

It is an arithmetic number, because the mean of its divisors is an integer number (43854116).

Almost surely, 2^861886272 is an apocalyptic number.

It is an amenable number.

861886272 is an abundant number, since it is smaller than the sum of its proper divisors (1593944224).

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

861886272 is a wasteful number, since it uses less digits than its factorization.

861886272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345335 (or 345325 counting only the distinct ones).

The product of its digits is 516096, while the sum is 48.

The square root of 861886272 is about 29357.8996523934. The cubic root of 861886272 is about 951.6632992391.

The spelling of 861886272 in words is "eight hundred sixty-one million, eight hundred eighty-six thousand, two hundred seventy-two".