861817692 has 12 divisors (see below), whose sum is σ = 2010907976. Its totient is φ = 287272560.

The previous prime is 861817651. The next prime is 861817741. The reversal of 861817692 is 296718168.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35909059 + ... + 35909082.

Almost surely, 2^861817692 is an apocalyptic number.

It is an amenable number.

861817692 is an abundant number, since it is smaller than the sum of its proper divisors (1149090284).

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

861817692 is a wasteful number, since it uses less digits than its factorization.

861817692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71818148 (or 71818146 counting only the distinct ones).

The product of its digits is 290304, while the sum is 48.

The square root of 861817692 is about 29356.7316300708. The cubic root of 861817692 is about 951.6380573937.

The spelling of 861817692 in words is "eight hundred sixty-one million, eight hundred seventeen thousand, six hundred ninety-two".