72684881 has 2 divisors, whose sum is σ = 72684882. Its totient is φ = 72684880.

The previous prime is 72684851. The next prime is 72684893. The reversal of 72684881 is 18848627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68624656 + 4060225 = 8284^2 + 2015^2 .

It is a cyclic number.

It is not a de Polignac number, because 72684881 - 2²² = 68490577 is a prime.

It is a super-2 number, since 2×72684881² = 10566183851968322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72684811) 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, 36342440 + 36342441.

It is an arithmetic number, because the mean of its divisors is an integer number (36342441).

Almost surely, 2^72684881 is an apocalyptic number.

It is an amenable number.

72684881 is a deficient number, since it is larger than the sum of its proper divisors (1).

72684881 is an equidigital number, since it uses as much as digits as its factorization.

72684881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172032, while the sum is 44.

The square root of 72684881 is about 8525.5428566162. The cubic root of 72684881 is about 417.3316873271.

The spelling of 72684881 in words is "seventy-two million, six hundred eighty-four thousand, eight hundred eighty-one".