72581528587 has 4 divisors (see below), whose sum is σ = 72584598096. Its totient is φ = 72578459080.

The previous prime is 72581528563. The next prime is 72581528647. The reversal of 72581528587 is 78582518527.

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

It is a cyclic number.

It is not a de Polignac number, because 72581528587 - 2²³ = 72573139979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72581528507) 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, 1499008 + ... + 1546669.

It is an arithmetic number, because the mean of its divisors is an integer number (18146149524).

Almost surely, 2^72581528587 is an apocalyptic number.

72581528587 is a deficient number, since it is larger than the sum of its proper divisors (3069509).

72581528587 is a wasteful number, since it uses less digits than its factorization.

72581528587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3069508.

The product of its digits is 12544000, while the sum is 58.

The spelling of 72581528587 in words is "seventy-two billion, five hundred eighty-one million, five hundred twenty-eight thousand, five hundred eighty-seven".