861909168 has 40 divisors (see below), whose sum is σ = 2229285888. Its totient is φ = 286956352.

The previous prime is 861909143. The next prime is 861909187.

861909168 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31021 + ... + 51827.

Almost surely, 2^861909168 is an apocalyptic number.

It is an amenable number.

861909168 is an abundant number, since it is smaller than the sum of its proper divisors (1367376720).

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

861909168 is a wasteful number, since it uses less digits than its factorization.

861909168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21681 (or 21675 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 861909168 is about 29358.2895959557. The cubic root of 861909168 is about 951.6717261398.

The spelling of 861909168 in words is "eight hundred sixty-one million, nine hundred nine thousand, one hundred sixty-eight".