72577613 has 4 divisors (see below), whose sum is σ = 72598908. Its totient is φ = 72556320.

The previous prime is 72577597. The next prime is 72577639. The reversal of 72577613 is 31677527.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47306884 + 25270729 = 6878^2 + 5027^2 .

It is a cyclic number.

It is not a de Polignac number, because 72577613 - 2⁴ = 72577597 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 (72577513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4256 + ... + 12777.

It is an arithmetic number, because the mean of its divisors is an integer number (18149727).

Almost surely, 2^72577613 is an apocalyptic number.

It is an amenable number.

72577613 is a deficient number, since it is larger than the sum of its proper divisors (21295).

72577613 is a wasteful number, since it uses less digits than its factorization.

72577613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21294.

The product of its digits is 61740, while the sum is 38.

The square root of 72577613 is about 8519.2495561522. The cubic root of 72577613 is about 417.1262875481.

The spelling of 72577613 in words is "seventy-two million, five hundred seventy-seven thousand, six hundred thirteen".