72587491 has 4 divisors (see below), whose sum is σ = 73506400. Its totient is φ = 71668584.

The previous prime is 72587423. The next prime is 72587509. The reversal of 72587491 is 19478527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19478527 = 43 ⋅452989.

It is a cyclic number.

It is not a de Polignac number, because 72587491 - 2⁹ = 72586979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72587891) 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, 459336 + ... + 459493.

It is an arithmetic number, because the mean of its divisors is an integer number (18376600).

Almost surely, 2^72587491 is an apocalyptic number.

72587491 is a deficient number, since it is larger than the sum of its proper divisors (918909).

72587491 is an equidigital number, since it uses as much as digits as its factorization.

72587491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918908.

The product of its digits is 141120, while the sum is 43.

The square root of 72587491 is about 8519.8292823272. The cubic root of 72587491 is about 417.1452106769.

The spelling of 72587491 in words is "seventy-two million, five hundred eighty-seven thousand, four hundred ninety-one".