72158723 has 12 divisors (see below), whose sum is σ = 90397440. Its totient is φ = 57092112.

The previous prime is 72158717. The next prime is 72158741. The reversal of 72158723 is 32785127.

It is not a de Polignac number, because 72158723 - 2²⁰ = 71110147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72158753) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56003 + ... + 57276.

It is an arithmetic number, because the mean of its divisors is an integer number (7533120).

Almost surely, 2^72158723 is an apocalyptic number.

72158723 is a deficient number, since it is larger than the sum of its proper divisors (18238717).

72158723 is a wasteful number, since it uses less digits than its factorization.

72158723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113306 (or 113299 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 72158723 is about 8494.6290678287. The cubic root of 72158723 is about 416.3222413070.

The spelling of 72158723 in words is "seventy-two million, one hundred fifty-eight thousand, seven hundred twenty-three".