72873561 has 8 divisors (see below), whose sum is σ = 97387840. Its totient is φ = 48470832.

The previous prime is 72873557. The next prime is 72873571. The reversal of 72873561 is 16537827.

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

It is not a de Polignac number, because 72873561 - 2² = 72873557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72873571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26350 + ... + 28983.

It is an arithmetic number, because the mean of its divisors is an integer number (12173480).

Almost surely, 2^72873561 is an apocalyptic number.

It is an amenable number.

72873561 is a deficient number, since it is larger than the sum of its proper divisors (24514279).

72873561 is a wasteful number, since it uses less digits than its factorization.

72873561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55775.

The product of its digits is 70560, while the sum is 39.

The square root of 72873561 is about 8536.6012557692. The cubic root of 72873561 is about 417.6924872861.

The spelling of 72873561 in words is "seventy-two million, eight hundred seventy-three thousand, five hundred sixty-one".