72694613 has 4 divisors (see below), whose sum is σ = 73444140. Its totient is φ = 71945088.

The previous prime is 72694591. The next prime is 72694631. The reversal of 72694613 is 31649627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31649627 = 353 ⋅89659.

It can be written as a sum of positive squares in 2 ways, for example, as 21743569 + 50951044 = 4663^2 + 7138^2 .

It is a cyclic number.

It is not a de Polignac number, because 72694613 - 2⁸ = 72694357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72694663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374618 + ... + 374811.

It is an arithmetic number, because the mean of its divisors is an integer number (18361035).

Almost surely, 2^72694613 is an apocalyptic number.

It is an amenable number.

72694613 is a deficient number, since it is larger than the sum of its proper divisors (749527).

72694613 is an equidigital number, since it uses as much as digits as its factorization.

72694613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749526.

The product of its digits is 54432, while the sum is 38.

The square root of 72694613 is about 8526.1135929566. The cubic root of 72694613 is about 417.3503124326.

The spelling of 72694613 in words is "seventy-two million, six hundred ninety-four thousand, six hundred thirteen".