72790681 has 4 divisors (see below), whose sum is σ = 72880164. Its totient is φ = 72701200.

The previous prime is 72790661. The next prime is 72790687. The reversal of 72790681 is 18609727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18609727 = 349 ⋅53323.

It can be written as a sum of positive squares in 2 ways, for example, as 6205081 + 66585600 = 2491^2 + 8160^2 .

It is a cyclic number.

It is not a de Polignac number, because 72790681 - 2⁵ = 72790649 is a prime.

It is a super-2 number, since 2×72790681² = 10596966480887522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72790687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43510 + ... + 45151.

It is an arithmetic number, because the mean of its divisors is an integer number (18220041).

Almost surely, 2^72790681 is an apocalyptic number.

It is an amenable number.

72790681 is a deficient number, since it is larger than the sum of its proper divisors (89483).

72790681 is an equidigital number, since it uses as much as digits as its factorization.

72790681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89482.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 72790681 is about 8531.7454837800. The cubic root of 72790681 is about 417.5340782777.

The spelling of 72790681 in words is "seventy-two million, seven hundred ninety thousand, six hundred eighty-one".