872978881 has 2 divisors, whose sum is σ = 872978882. Its totient is φ = 872978880.

The previous prime is 872978861. The next prime is 872978923. The reversal of 872978881 is 188879278.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 718722481 + 154256400 = 26809^2 + 12420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-872978881 is a prime.

It is a super-2 number, since 2×872978881² = 1524184253344024322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (872978801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436489440 + 436489441.

It is an arithmetic number, because the mean of its divisors is an integer number (436489441).

Almost surely, 2^872978881 is an apocalyptic number.

It is an amenable number.

872978881 is a deficient number, since it is larger than the sum of its proper divisors (1).

872978881 is an equidigital number, since it uses as much as digits as its factorization.

872978881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3612672, while the sum is 58.

The square root of 872978881 is about 29546.2160182992. The cubic root of 872978881 is about 955.7285928693.

The spelling of 872978881 in words is "eight hundred seventy-two million, nine hundred seventy-eight thousand, eight hundred eighty-one".