72743971 has 4 divisors (see below), whose sum is σ = 72781200. Its totient is φ = 72706744.

The previous prime is 72743947. The next prime is 72743981. The reversal of 72743971 is 17934727.

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

It is a cyclic number.

It is not a de Polignac number, because 72743971 - 2²¹ = 70646819 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72743941) 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, 15511 + ... + 19648.

It is an arithmetic number, because the mean of its divisors is an integer number (18195300).

Almost surely, 2^72743971 is an apocalyptic number.

72743971 is a deficient number, since it is larger than the sum of its proper divisors (37229).

72743971 is a wasteful number, since it uses less digits than its factorization.

72743971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37228.

The product of its digits is 74088, while the sum is 40.

The square root of 72743971 is about 8529.0076210542. The cubic root of 72743971 is about 417.4447482072. Note that the first 3 decimals are identical.

The spelling of 72743971 in words is "seventy-two million, seven hundred forty-three thousand, nine hundred seventy-one".