72972111 has 4 divisors (see below), whose sum is σ = 97296152. Its totient is φ = 48648072.

The previous prime is 72972089. The next prime is 72972127. The reversal of 72972111 is 11127927.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 72972111 - 2¹⁵ = 72939343 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 (72972311) 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, 12162016 + ... + 12162021.

It is an arithmetic number, because the mean of its divisors is an integer number (24324038).

Almost surely, 2^72972111 is an apocalyptic number.

72972111 is a deficient number, since it is larger than the sum of its proper divisors (24324041).

72972111 is a wasteful number, since it uses less digits than its factorization.

72972111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24324040.

The product of its digits is 1764, while the sum is 30.

The square root of 72972111 is about 8542.3715091302. The cubic root of 72972111 is about 417.8806902147.

The spelling of 72972111 in words is "seventy-two million, nine hundred seventy-two thousand, one hundred eleven".