72959881 has 2 divisors, whose sum is σ = 72959882. Its totient is φ = 72959880.

The previous prime is 72959879. The next prime is 72959891. The reversal of 72959881 is 18895927.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69039481 + 3920400 = 8309^2 + 1980^2 .

It is a cyclic number.

It is not a de Polignac number, because 72959881 - 2¹ = 72959879 is a prime.

It is a super-2 number, since 2×72959881² = 10646288471068322, which contains 22 as substring.

Together with 72959879, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72959891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36479940 + 36479941.

It is an arithmetic number, because the mean of its divisors is an integer number (36479941).

Almost surely, 2^72959881 is an apocalyptic number.

It is an amenable number.

72959881 is a deficient number, since it is larger than the sum of its proper divisors (1).

72959881 is an equidigital number, since it uses as much as digits as its factorization.

72959881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 49.

The square root of 72959881 is about 8541.6556357652. The cubic root of 72959881 is about 417.8573435493.

The spelling of 72959881 in words is "seventy-two million, nine hundred fifty-nine thousand, eight hundred eighty-one".