72162591 has 8 divisors (see below), whose sum is σ = 97068720. Its totient is φ = 47682432.

The previous prime is 72162547. The next prime is 72162593. The reversal of 72162591 is 19526127.

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

It is a de Polignac number, because none of the positive numbers 2^k-72162591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72162593) 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, 106096 + ... + 106773.

It is an arithmetic number, because the mean of its divisors is an integer number (12133590).

Almost surely, 2^72162591 is an apocalyptic number.

72162591 is a deficient number, since it is larger than the sum of its proper divisors (24906129).

72162591 is a wasteful number, since it uses less digits than its factorization.

72162591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212985.

The product of its digits is 7560, while the sum is 33.

The square root of 72162591 is about 8494.8567380504. The cubic root of 72162591 is about 416.3296800273.

The spelling of 72162591 in words is "seventy-two million, one hundred sixty-two thousand, five hundred ninety-one".