72122229 has 6 divisors (see below), whose sum is σ = 104176566. Its totient is φ = 48081480.

The previous prime is 72122221. The next prime is 72122251. The reversal of 72122229 is 92222127.

It can be written as a sum of positive squares in only one way, i.e., 56700900 + 15421329 = 7530^2 + 3927^2 .

It is not a de Polignac number, because 72122229 - 2³ = 72122221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72122221) 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, 4006782 + ... + 4006799.

It is an arithmetic number, because the mean of its divisors is an integer number (17362761).

Almost surely, 2^72122229 is an apocalyptic number.

It is an amenable number.

72122229 is a deficient number, since it is larger than the sum of its proper divisors (32054337).

72122229 is a wasteful number, since it uses less digits than its factorization.

72122229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8013587 (or 8013584 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 72122229 is about 8492.4807329778. The cubic root of 72122229 is about 416.2520450079.

The spelling of 72122229 in words is "seventy-two million, one hundred twenty-two thousand, two hundred twenty-nine".