863772872 has 16 divisors (see below), whose sum is σ = 1620588060. Its totient is φ = 431616064.

The previous prime is 863772869. The next prime is 863772919. The reversal of 863772872 is 278277368.

It can be written as a sum of positive squares in 2 ways, for example, as 794450596 + 69322276 = 28186^2 + 8326^2 .

It is a super-3 number, since 3×863772872³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 863772872.

It is an unprimeable number.

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, 19883 + ... + 46074.

Almost surely, 2^863772872 is an apocalyptic number.

It is an amenable number.

863772872 is a deficient number, since it is larger than the sum of its proper divisors (756815188).

863772872 is a wasteful number, since it uses less digits than its factorization.

863772872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67600 (or 67596 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 50.

The square root of 863772872 is about 29390.0131337160. The cubic root of 863772872 is about 952.3571647865.

The spelling of 863772872 in words is "eight hundred sixty-three million, seven hundred seventy-two thousand, eight hundred seventy-two".