72613537 has 2 divisors, whose sum is σ = 72613538. Its totient is φ = 72613536.

The previous prime is 72613531. The next prime is 72613549. The reversal of 72613537 is 73531627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57744801 + 14868736 = 7599^2 + 3856^2 .

It is a cyclic number.

It is not a de Polignac number, because 72613537 - 2³ = 72613529 is a prime.

It is not a weakly prime, because it can be changed into another prime (72613531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36306768 + 36306769.

It is an arithmetic number, because the mean of its divisors is an integer number (36306769).

Almost surely, 2^72613537 is an apocalyptic number.

It is an amenable number.

72613537 is a deficient number, since it is larger than the sum of its proper divisors (1).

72613537 is an equidigital number, since it uses as much as digits as its factorization.

72613537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 34.

The square root of 72613537 is about 8521.3576969870. The cubic root of 72613537 is about 417.1950983583.

The spelling of 72613537 in words is "seventy-two million, six hundred thirteen thousand, five hundred thirty-seven".