72584581 has 4 divisors (see below), whose sum is σ = 72860832. Its totient is φ = 72308332.

The previous prime is 72584569. The next prime is 72584623. The reversal of 72584581 is 18548527.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72584581 - 2¹¹ = 72582533 is a prime.

It is a super-2 number, since 2×72584581² = 10537042797891122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72584521) 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, 137731 + ... + 138256.

It is an arithmetic number, because the mean of its divisors is an integer number (18215208).

Almost surely, 2^72584581 is an apocalyptic number.

It is an amenable number.

72584581 is a deficient number, since it is larger than the sum of its proper divisors (276251).

72584581 is a wasteful number, since it uses less digits than its factorization.

72584581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276250.

The product of its digits is 89600, while the sum is 40.

The square root of 72584581 is about 8519.6585025457. The cubic root of 72584581 is about 417.1396362142.

The spelling of 72584581 in words is "seventy-two million, five hundred eighty-four thousand, five hundred eighty-one".