861827164 has 24 divisors (see below), whose sum is σ = 1669868928. Its totient is φ = 385891440.

The previous prime is 861827159. The next prime is 861827167. The reversal of 861827164 is 461728168.

It is a self number, because there is not a number n which added to its sum of digits gives 861827164.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861827167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143224 + ... + 149119.

It is an arithmetic number, because the mean of its divisors is an integer number (69577872).

Almost surely, 2^861827164 is an apocalyptic number.

It is an amenable number.

861827164 is a deficient number, since it is larger than the sum of its proper divisors (808041764).

861827164 is a wasteful number, since it uses less digits than its factorization.

861827164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292425 (or 292423 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 861827164 is about 29356.8929554883. The cubic root of 861827164 is about 951.6415437779.

The spelling of 861827164 in words is "eight hundred sixty-one million, eight hundred twenty-seven thousand, one hundred sixty-four".