56872879870921 has 9 divisors (see below), whose sum is σ = 57663190926471. Its totient is φ = 56093256343152.

The previous prime is 56872879870871. The next prime is 56872879870927. The reversal of 56872879870921 is 12907897827865.

The square root of 56872879870921 is 7541411.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 32283817153225 + 24589062717696 = 5681885^2 + 4958736^2 .

It is not a de Polignac number, because 56872879870921 - 2¹¹ = 56872879868873 is a prime.

It is a super-2 number, since 2×56872879870921² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56872879870927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 550471350 + ... + 550574656.

Almost surely, 2^{56872879870921} is an apocalyptic number.

56872879870921 is the 7541411-st square number.

56872879870921 is the 3770706-th centered octagonal number.

It is an amenable number.

56872879870921 is a deficient number, since it is larger than the sum of its proper divisors (790311055550).

56872879870921 is an frugal number, since it uses more digits than its factorization.

56872879870921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206760 (or 103380 counting only the distinct ones).

The product of its (nonzero) digits is 1706987520, while the sum is 79.

The spelling of 56872879870921 in words is "fifty-six trillion, eight hundred seventy-two billion, eight hundred seventy-nine million, eight hundred seventy thousand, nine hundred twenty-one".