872131720 has 16 divisors (see below), whose sum is σ = 1962296460. Its totient is φ = 348852672.

The previous prime is 872131693. The next prime is 872131727. The reversal of 872131720 is 27131278.

It can be written as a sum of positive squares in 2 ways, for example, as 751527396 + 120604324 = 27414^2 + 10982^2 .

It is a super-2 number, since 2×872131720² = 1521227474060316800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (872131727) 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 3 ways as a sum of consecutive naturals, for example, 10901607 + ... + 10901686.

Almost surely, 2^872131720 is an apocalyptic number.

It is an amenable number.

872131720 is an abundant number, since it is smaller than the sum of its proper divisors (1090164740).

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

872131720 is a wasteful number, since it uses less digits than its factorization.

872131720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21803304 (or 21803300 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 872131720 is about 29531.8763372733. The cubic root of 872131720 is about 955.4193383337.

Adding to 872131720 its reverse (27131278), we get a palindrome (899262998).

The spelling of 872131720 in words is "eight hundred seventy-two million, one hundred thirty-one thousand, seven hundred twenty".