72239691 has 16 divisors (see below), whose sum is σ = 102009600. Its totient is φ = 45345888.

The previous prime is 72239669. The next prime is 72239701. The reversal of 72239691 is 19693227.

It is not a de Polignac number, because 72239691 - 2¹³ = 72231499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72239621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5725 + ... + 13313.

It is an arithmetic number, because the mean of its divisors is an integer number (6375600).

Almost surely, 2^72239691 is an apocalyptic number.

72239691 is a deficient number, since it is larger than the sum of its proper divisors (29769909).

72239691 is a wasteful number, since it uses less digits than its factorization.

72239691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7778.

The product of its digits is 40824, while the sum is 39.

The square root of 72239691 is about 8499.3935666023. The cubic root of 72239691 is about 416.4778989909.

The spelling of 72239691 in words is "seventy-two million, two hundred thirty-nine thousand, six hundred ninety-one".