861072052 has 12 divisors (see below), whose sum is σ = 1507326436. Its totient is φ = 430407360.

The previous prime is 861072041. The next prime is 861072053. The reversal of 861072052 is 250270168.

It can be written as a sum of positive squares in 2 ways, for example, as 492662416 + 368409636 = 22196^2 + 19194^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861072053) 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, 16233 + ... + 44560.

Almost surely, 2^861072052 is an apocalyptic number.

It is an amenable number.

861072052 is a deficient number, since it is larger than the sum of its proper divisors (646254384).

861072052 is a wasteful number, since it uses less digits than its factorization.

861072052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64338 (or 64336 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 861072052 is about 29344.0292393529. The cubic root of 861072052 is about 951.3635275066.

The spelling of 861072052 in words is "eight hundred sixty-one million, seventy-two thousand, fifty-two".