72887521 has 8 divisors (see below), whose sum is σ = 85551680. Its totient is φ = 60786288.

The previous prime is 72887501. The next prime is 72887567. The reversal of 72887521 is 12578827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72887521 - 2¹³ = 72879329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72887501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140451 + ... + 140968.

It is an arithmetic number, because the mean of its divisors is an integer number (10693960).

Almost surely, 2^72887521 is an apocalyptic number.

It is an amenable number.

72887521 is a deficient number, since it is larger than the sum of its proper divisors (12664159).

72887521 is a wasteful number, since it uses less digits than its factorization.

72887521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281463.

The product of its digits is 62720, while the sum is 40.

The square root of 72887521 is about 8537.4188722353. The cubic root of 72887521 is about 417.7191572916.

The spelling of 72887521 in words is "seventy-two million, eight hundred eighty-seven thousand, five hundred twenty-one".