72731611 has 8 divisors (see below), whose sum is σ = 75622400. Its totient is φ = 69874920.

The previous prime is 72731567. The next prime is 72731621. The reversal of 72731611 is 11613727.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72731611 - 2¹⁹ = 72207323 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 72731611.

It is not an unprimeable number, because it can be changed into a prime (72731621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4131 + ... + 12748.

It is an arithmetic number, because the mean of its divisors is an integer number (9452800).

Almost surely, 2^72731611 is an apocalyptic number.

72731611 is a deficient number, since it is larger than the sum of its proper divisors (2890789).

72731611 is a wasteful number, since it uses less digits than its factorization.

72731611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17049.

The product of its digits is 1764, while the sum is 28.

The square root of 72731611 is about 8528.2830042160. The cubic root of 72731611 is about 417.4211040515.

The spelling of 72731611 in words is "seventy-two million, seven hundred thirty-one thousand, six hundred eleven".