129722228 has 24 divisors (see below), whose sum is σ = 239796480. Its totient is φ = 61306560.

The previous prime is 129722161. The next prime is 129722233. The reversal of 129722228 is 822227921.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6833 + ... + 17496.

It is an arithmetic number, because the mean of its divisors is an integer number (9991520).

Almost surely, 2^129722228 is an apocalyptic number.

It is an amenable number.

129722228 is a deficient number, since it is larger than the sum of its proper divisors (110074252).

129722228 is a wasteful number, since it uses less digits than its factorization.

129722228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24407 (or 24405 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 129722228 is about 11389.5666291567. The cubic root of 129722228 is about 506.2186403783.

The spelling of 129722228 in words is "one hundred twenty-nine million, seven hundred twenty-two thousand, two hundred twenty-eight".