72657491 has 2 divisors, whose sum is σ = 72657492. Its totient is φ = 72657490.

The previous prime is 72657467. The next prime is 72657493. The reversal of 72657491 is 19475627.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72657491 is a prime.

It is a super-2 number, since 2×72657491² = 10558221996830162, which contains 22 as substring.

Together with 72657493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72657493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36328745 + 36328746.

It is an arithmetic number, because the mean of its divisors is an integer number (36328746).

Almost surely, 2^72657491 is an apocalyptic number.

72657491 is a deficient number, since it is larger than the sum of its proper divisors (1).

72657491 is an equidigital number, since it uses as much as digits as its factorization.

72657491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 41.

The square root of 72657491 is about 8523.9363559332. The cubic root of 72657491 is about 417.2792594087.

The spelling of 72657491 in words is "seventy-two million, six hundred fifty-seven thousand, four hundred ninety-one".