861914564 has 24 divisors (see below), whose sum is σ = 1724452800. Its totient is φ = 369258336.

The previous prime is 861914561. The next prime is 861914591. The reversal of 861914564 is 465419168.

It is not an unprimeable number, because it can be changed into a prime (861914561) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 139754 + ... + 145790.

It is an arithmetic number, because the mean of its divisors is an integer number (71852200).

Almost surely, 2^861914564 is an apocalyptic number.

It is an amenable number.

861914564 is an abundant number, since it is smaller than the sum of its proper divisors (862538236).

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

861914564 is a wasteful number, since it uses less digits than its factorization.

861914564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11147 (or 11145 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 861914564 is about 29358.3814948985. The cubic root of 861914564 is about 951.6737121224.

The spelling of 861914564 in words is "eight hundred sixty-one million, nine hundred fourteen thousand, five hundred sixty-four".