72478591 has 4 divisors (see below), whose sum is σ = 72508752. Its totient is φ = 72448432.

The previous prime is 72478583. The next prime is 72478619. The reversal of 72478591 is 19587427.

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 72478591 - 2³ = 72478583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72478541) 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, 11131 + ... + 16396.

It is an arithmetic number, because the mean of its divisors is an integer number (18127188).

Almost surely, 2^72478591 is an apocalyptic number.

72478591 is a deficient number, since it is larger than the sum of its proper divisors (30161).

72478591 is a wasteful number, since it uses less digits than its factorization.

72478591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30160.

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

The square root of 72478591 is about 8513.4359103713. The cubic root of 72478591 is about 416.9364977189.

The spelling of 72478591 in words is "seventy-two million, four hundred seventy-eight thousand, five hundred ninety-one".