861485728 has 24 divisors (see below), whose sum is σ = 1704671892. Its totient is φ = 428553216.

The previous prime is 861485719. The next prime is 861485731. The reversal of 861485728 is 827584168.

It can be written as a sum of positive squares in 2 ways, for example, as 733976464 + 127509264 = 27092^2 + 11292^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62025 + ... + 74632.

Almost surely, 2^861485728 is an apocalyptic number.

It is an amenable number.

861485728 is a deficient number, since it is larger than the sum of its proper divisors (843186164).

861485728 is a wasteful number, since it uses less digits than its factorization.

861485728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136864 (or 136856 counting only the distinct ones).

The product of its digits is 860160, while the sum is 49.

The square root of 861485728 is about 29351.0771182252. The cubic root of 861485728 is about 951.5158543843.

The spelling of 861485728 in words is "eight hundred sixty-one million, four hundred eighty-five thousand, seven hundred twenty-eight".