72474431 has 2 divisors, whose sum is σ = 72474432. Its totient is φ = 72474430.

The previous prime is 72474401. The next prime is 72474443. The reversal of 72474431 is 13447427.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72474431 is a prime.

It is a super-2 number, since 2×72474431² = 10505086297547522, 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 (72474401) 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, 36237215 + 36237216.

It is an arithmetic number, because the mean of its divisors is an integer number (36237216).

Almost surely, 2^72474431 is an apocalyptic number.

72474431 is a deficient number, since it is larger than the sum of its proper divisors (1).

72474431 is an equidigital number, since it uses as much as digits as its factorization.

72474431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 32.

The square root of 72474431 is about 8513.1915871781. The cubic root of 72474431 is about 416.9285207012.

The spelling of 72474431 in words is "seventy-two million, four hundred seventy-four thousand, four hundred thirty-one".