861056028 has 72 divisors (see below), whose sum is σ = 2596851600. Its totient is φ = 246014496.

The previous prime is 861056017. The next prime is 861056111. The reversal of 861056028 is 820650168.

It is a happy number.

861056028 is a `hidden beast` number, since 86 + 10 + 560 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 861055983 and 861056001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76063 + ... + 86646.

Almost surely, 2^861056028 is an apocalyptic number.

It is an amenable number.

861056028 is an abundant number, since it is smaller than the sum of its proper divisors (1735795572).

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

861056028 is a wasteful number, since it uses less digits than its factorization.

861056028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162736 (or 162721 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 861056028 is about 29343.7562012773. The cubic root of 861056028 is about 951.3576260478.

The spelling of 861056028 in words is "eight hundred sixty-one million, fifty-six thousand, twenty-eight".