72323771 has 4 divisors (see below), whose sum is σ = 77887152. Its totient is φ = 66760392.

The previous prime is 72323759. The next prime is 72323773. The reversal of 72323771 is 17732327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17732327 = 173 ⋅102499.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72323771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72323773) 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, 2781671 + ... + 2781696.

It is an arithmetic number, because the mean of its divisors is an integer number (19471788).

Almost surely, 2^72323771 is an apocalyptic number.

72323771 is a deficient number, since it is larger than the sum of its proper divisors (5563381).

72323771 is a wasteful number, since it uses less digits than its factorization.

72323771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5563380.

The product of its digits is 12348, while the sum is 32.

The square root of 72323771 is about 8504.3383634472. The cubic root of 72323771 is about 416.6394163156.

The spelling of 72323771 in words is "seventy-two million, three hundred twenty-three thousand, seven hundred seventy-one".