72504527891 has 4 divisors (see below), whose sum is σ = 72505114800. Its totient is φ = 72503940984.

The previous prime is 72504527861. The next prime is 72504527923. The reversal of 72504527891 is 19872540527.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 72504527891 - 2¹⁰ = 72504526867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72504527831) 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, 28271 + ... + 381848.

It is an arithmetic number, because the mean of its divisors is an integer number (18126278700).

Almost surely, 2^72504527891 is an apocalyptic number.

72504527891 is a deficient number, since it is larger than the sum of its proper divisors (586909).

72504527891 is a wasteful number, since it uses less digits than its factorization.

72504527891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586908.

The product of its (nonzero) digits is 1411200, while the sum is 50.

The spelling of 72504527891 in words is "seventy-two billion, five hundred four million, five hundred twenty-seven thousand, eight hundred ninety-one".