72122691 has 8 divisors (see below), whose sum is σ = 96866064. Its totient is φ = 47730560.

The previous prime is 72122683. The next prime is 72122707. The reversal of 72122691 is 19622127.

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 72122691 - 2³ = 72122683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72121691) 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, 87330 + ... + 88151.

It is an arithmetic number, because the mean of its divisors is an integer number (12108258).

Almost surely, 2^72122691 is an apocalyptic number.

72122691 is a deficient number, since it is larger than the sum of its proper divisors (24743373).

72122691 is a wasteful number, since it uses less digits than its factorization.

72122691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175621.

The product of its digits is 3024, while the sum is 30.

The square root of 72122691 is about 8492.5079334670. The cubic root of 72122691 is about 416.2529338141.

The spelling of 72122691 in words is "seventy-two million, one hundred twenty-two thousand, six hundred ninety-one".