72739081 has 2 divisors, whose sum is σ = 72739082. Its totient is φ = 72739080.

The previous prime is 72739067. The next prime is 72739109. The reversal of 72739081 is 18093727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58982400 + 13756681 = 7680^2 + 3709^2 .

It is a cyclic number.

It is not a de Polignac number, because 72739081 - 2⁹ = 72738569 is a prime.

It is a super-2 number, since 2×72739081² = 10581947809449122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72739081.

It is not a weakly prime, because it can be changed into another prime (72709081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36369540 + 36369541.

It is an arithmetic number, because the mean of its divisors is an integer number (36369541).

Almost surely, 2^72739081 is an apocalyptic number.

It is an amenable number.

72739081 is a deficient number, since it is larger than the sum of its proper divisors (1).

72739081 is an equidigital number, since it uses as much as digits as its factorization.

72739081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 72739081 is about 8528.7209474809. The cubic root of 72739081 is about 417.4353941649.

The spelling of 72739081 in words is "seventy-two million, seven hundred thirty-nine thousand, eighty-one".