72445691 has 2 divisors, whose sum is σ = 72445692. Its totient is φ = 72445690.

The previous prime is 72445661. The next prime is 72445739. The reversal of 72445691 is 19654427.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72445691 - 2⁶ = 72445627 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72445601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36222845 + 36222846.

It is an arithmetic number, because the mean of its divisors is an integer number (36222846).

Almost surely, 2^72445691 is an apocalyptic number.

72445691 is a deficient number, since it is larger than the sum of its proper divisors (1).

72445691 is an equidigital number, since it uses as much as digits as its factorization.

72445691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 72445691 is about 8511.5034512124. The cubic root of 72445691 is about 416.8734019061.

The spelling of 72445691 in words is "seventy-two million, four hundred forty-five thousand, six hundred ninety-one".