72972723 has 4 divisors (see below), whose sum is σ = 97296968. Its totient is φ = 48648480.

The previous prime is 72972709. The next prime is 72972727. The reversal of 72972723 is 32727927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32727927 = 3 ⋅10909309.

It is not a de Polignac number, because 72972723 - 2⁴ = 72972707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72972727) 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, 12162118 + ... + 12162123.

It is an arithmetic number, because the mean of its divisors is an integer number (24324242).

Almost surely, 2^72972723 is an apocalyptic number.

72972723 is a deficient number, since it is larger than the sum of its proper divisors (24324245).

72972723 is a wasteful number, since it uses less digits than its factorization.

72972723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24324244.

The product of its digits is 74088, while the sum is 39.

The square root of 72972723 is about 8542.4073304895. The cubic root of 72972723 is about 417.8818584339.

The spelling of 72972723 in words is "seventy-two million, nine hundred seventy-two thousand, seven hundred twenty-three".