861977472 has 32 divisors (see below), whose sum is σ = 2289628680. Its totient is φ = 287325696.

The previous prime is 861977471. The next prime is 861977477. The reversal of 861977472 is 274779168.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861977471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1121983 + ... + 1122750.

Almost surely, 2^861977472 is an apocalyptic number.

It is an amenable number.

861977472 is an abundant number, since it is smaller than the sum of its proper divisors (1427651208).

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

861977472 is a wasteful number, since it uses less digits than its factorization.

861977472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2244750 (or 2244738 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 51.

The square root of 861977472 is about 29359.4528559372. The cubic root of 861977472 is about 951.6968646234.

The spelling of 861977472 in words is "eight hundred sixty-one million, nine hundred seventy-seven thousand, four hundred seventy-two".