72972737 has 4 divisors (see below), whose sum is σ = 73027716. Its totient is φ = 72917760.

The previous prime is 72972727. The next prime is 72972761. The reversal of 72972737 is 73727927.

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

It can be written as a sum of positive squares in 2 ways, for example, as 46799281 + 26173456 = 6841^2 + 5116^2 .

It is a cyclic number.

It is not a de Polignac number, because 72972737 - 2¹⁶ = 72907201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72972707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25448 + ... + 28169.

It is an arithmetic number, because the mean of its divisors is an integer number (18256929).

Almost surely, 2^72972737 is an apocalyptic number.

It is an amenable number.

72972737 is a deficient number, since it is larger than the sum of its proper divisors (54979).

72972737 is a wasteful number, since it uses less digits than its factorization.

72972737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54978.

The product of its digits is 259308, while the sum is 44.

The square root of 72972737 is about 8542.4081499306. The cubic root of 72972737 is about 417.8818851578.

The spelling of 72972737 in words is "seventy-two million, nine hundred seventy-two thousand, seven hundred thirty-seven".