861872650 has 24 divisors (see below), whose sum is σ = 1640368224. Its totient is φ = 336730800.

The previous prime is 861872639. The next prime is 861872651. The reversal of 861872650 is 56278168.

861872650 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a junction number, because it is equal to n+sod(n) for n = 861872597 and 861872606.

It is not an unprimeable number, because it can be changed into a prime (861872651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198286 + ... + 202585.

It is an arithmetic number, because the mean of its divisors is an integer number (68348676).

Almost surely, 2^861872650 is an apocalyptic number.

861872650 is a deficient number, since it is larger than the sum of its proper divisors (778495574).

861872650 is a wasteful number, since it uses less digits than its factorization.

861872650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400926 (or 400921 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 861872650 is about 29357.6676525912. The cubic root of 861872650 is about 951.6582855747.

The spelling of 861872650 in words is "eight hundred sixty-one million, eight hundred seventy-two thousand, six hundred fifty".