72608691 has 4 divisors (see below), whose sum is σ = 96811592. Its totient is φ = 48405792.

The previous prime is 72608659. The next prime is 72608719. The reversal of 72608691 is 19680627.

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

It is not a de Polignac number, because 72608691 - 2⁵ = 72608659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72608611) 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, 12101446 + ... + 12101451.

It is an arithmetic number, because the mean of its divisors is an integer number (24202898).

Almost surely, 2^72608691 is an apocalyptic number.

72608691 is a deficient number, since it is larger than the sum of its proper divisors (24202901).

72608691 is a wasteful number, since it uses less digits than its factorization.

72608691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24202900.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 72608691 is about 8521.0733478829. The cubic root of 72608691 is about 417.1858173872.

It can be divided in two parts, 7260 and 8691, that added together give a palindrome (15951).

The spelling of 72608691 in words is "seventy-two million, six hundred eight thousand, six hundred ninety-one".