72115823 has 4 divisors (see below), whose sum is σ = 77663208. Its totient is φ = 66568440.

The previous prime is 72115789. The next prime is 72115871. The reversal of 72115823 is 32851127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32851127 = 41 ⋅801247.

It is a cyclic number.

It is not a de Polignac number, because 72115823 - 2¹² = 72111727 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 (72115423) 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, 2773673 + ... + 2773698.

It is an arithmetic number, because the mean of its divisors is an integer number (19415802).

Almost surely, 2^72115823 is an apocalyptic number.

72115823 is a deficient number, since it is larger than the sum of its proper divisors (5547385).

72115823 is a wasteful number, since it uses less digits than its factorization.

72115823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5547384.

The product of its digits is 3360, while the sum is 29.

The square root of 72115823 is about 8492.1035674325. The cubic root of 72115823 is about 416.2397206082.

The spelling of 72115823 in words is "seventy-two million, one hundred fifteen thousand, eight hundred twenty-three".