72267891 has 4 divisors (see below), whose sum is σ = 96357192. Its totient is φ = 48178592.

The previous prime is 72267889. The next prime is 72267961. The reversal of 72267891 is 19876227.

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 72267891 - 2¹ = 72267889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72268891) 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, 12044646 + ... + 12044651.

It is an arithmetic number, because the mean of its divisors is an integer number (24089298).

Almost surely, 2^72267891 is an apocalyptic number.

72267891 is a deficient number, since it is larger than the sum of its proper divisors (24089301).

72267891 is a wasteful number, since it uses less digits than its factorization.

72267891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24089300.

The product of its digits is 84672, while the sum is 42.

The square root of 72267891 is about 8501.0523466216. The cubic root of 72267891 is about 416.5320850331.

The spelling of 72267891 in words is "seventy-two million, two hundred sixty-seven thousand, eight hundred ninety-one".