72604991 has 2 divisors, whose sum is σ = 72604992. Its totient is φ = 72604990.

The previous prime is 72604981. The next prime is 72605017. The reversal of 72604991 is 19940627.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72604991 is a prime.

It is a super-2 number, since 2×72604991² = 10542969436220162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72604981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36302495 + 36302496.

It is an arithmetic number, because the mean of its divisors is an integer number (36302496).

Almost surely, 2^72604991 is an apocalyptic number.

72604991 is a deficient number, since it is larger than the sum of its proper divisors (1).

72604991 is an equidigital number, since it uses as much as digits as its factorization.

72604991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 72604991 is about 8520.8562363180. The cubic root of 72604991 is about 417.1787309364.

The spelling of 72604991 in words is "seventy-two million, six hundred four thousand, nine hundred ninety-one".