72339961 has 6 divisors (see below), whose sum is σ = 73549086. Its totient is φ = 71150400.

The previous prime is 72339919. The next prime is 72339977. The reversal of 72339961 is 16993327.

It can be written as a sum of positive squares in 3 ways, for example, as 8643600 + 63696361 = 2940^2 + 7981^2 .

It is not a de Polignac number, because 72339961 - 2¹³ = 72331769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72339361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6000 + ... + 13441.

It is an arithmetic number, because the mean of its divisors is an integer number (12258181).

Almost surely, 2^72339961 is an apocalyptic number.

It is an amenable number.

72339961 is a deficient number, since it is larger than the sum of its proper divisors (1209125).

72339961 is an equidigital number, since it uses as much as digits as its factorization.

72339961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19563 (or 19502 counting only the distinct ones).

The product of its digits is 61236, while the sum is 40.

The square root of 72339961 is about 8505.2901772955. The cubic root of 72339961 is about 416.6705028625.

The spelling of 72339961 in words is "seventy-two million, three hundred thirty-nine thousand, nine hundred sixty-one".