861782868 has 48 divisors (see below), whose sum is σ = 2270896320. Its totient is φ = 282549600.

The previous prime is 861782843. The next prime is 861782881. The reversal of 861782868 is 868287168.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58818 + ... + 71993.

It is an arithmetic number, because the mean of its divisors is an integer number (47310340).

Almost surely, 2^861782868 is an apocalyptic number.

It is an amenable number.

861782868 is an abundant number, since it is smaller than the sum of its proper divisors (1409113452).

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

861782868 is a wasteful number, since it uses less digits than its factorization.

861782868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130885 (or 130877 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 54.

The square root of 861782868 is about 29356.1385062818. The cubic root of 861782868 is about 951.6252394120.

The spelling of 861782868 in words is "eight hundred sixty-one million, seven hundred eighty-two thousand, eight hundred sixty-eight".