72666337 has 4 divisors (see below), whose sum is σ = 72874900. Its totient is φ = 72457776.

The previous prime is 72666331. The next prime is 72666359. The reversal of 72666337 is 73366627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73366627 = 227 ⋅323201.

It can be written as a sum of positive squares in 2 ways, for example, as 43678881 + 28987456 = 6609^2 + 5384^2 .

It is a cyclic number.

It is not a de Polignac number, because 72666337 - 2¹⁵ = 72633569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72666337.

It is not an unprimeable number, because it can be changed into a prime (72666331) 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, 103758 + ... + 104455.

It is an arithmetic number, because the mean of its divisors is an integer number (18218725).

Almost surely, 2^72666337 is an apocalyptic number.

It is an amenable number.

72666337 is a deficient number, since it is larger than the sum of its proper divisors (208563).

72666337 is a wasteful number, since it uses less digits than its factorization.

72666337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208562.

The product of its digits is 190512, while the sum is 40.

The square root of 72666337 is about 8524.4552318609. The cubic root of 72666337 is about 417.2961932100.

It can be divided in two parts, 72666 and 337, that multiplied together give a palindrome (24488442).

The spelling of 72666337 in words is "seventy-two million, six hundred sixty-six thousand, three hundred thirty-seven".