72943613 has 16 divisors (see below), whose sum is σ = 78172080. Its totient is φ = 67931136.

The previous prime is 72943601. The next prime is 72943621. The reversal of 72943613 is 31634927.

It can be written as a sum of positive squares in 8 ways, for example, as 574564 + 72369049 = 758^2 + 8507^2 .

It is a cyclic number.

It is not a de Polignac number, because 72943613 - 2⁴ = 72943597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72943643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168245 + ... + 168677.

It is an arithmetic number, because the mean of its divisors is an integer number (4885755).

Almost surely, 2^72943613 is an apocalyptic number.

It is an amenable number.

72943613 is a deficient number, since it is larger than the sum of its proper divisors (5228467).

72943613 is a wasteful number, since it uses less digits than its factorization.

72943613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656.

The product of its digits is 27216, while the sum is 35.

The square root of 72943613 is about 8540.7033082762. The cubic root of 72943613 is about 417.8262844318.

The spelling of 72943613 in words is "seventy-two million, nine hundred forty-three thousand, six hundred thirteen".