861100028 has 12 divisors (see below), whose sum is σ = 1507741032. Its totient is φ = 430316880.

The previous prime is 861100003. The next prime is 861100039. The reversal of 861100028 is 820001168.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49838 + ... + 64853.

It is an arithmetic number, because the mean of its divisors is an integer number (125645086).

Almost surely, 2^861100028 is an apocalyptic number.

It is an amenable number.

861100028 is a deficient number, since it is larger than the sum of its proper divisors (646641004).

861100028 is a wasteful number, since it uses less digits than its factorization.

861100028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116572 (or 116570 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 861100028 is about 29344.5059253006. The cubic root of 861100028 is about 951.3738305770.

The spelling of 861100028 in words is "eight hundred sixty-one million, one hundred thousand, twenty-eight".