129728422 has 8 divisors (see below), whose sum is σ = 195993000. Its totient is φ = 64397424.

The previous prime is 129728381. The next prime is 129728429. The reversal of 129728422 is 224827921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×129728422² = 33658926949220168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129728429) 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, 233047 + ... + 233602.

It is an arithmetic number, because the mean of its divisors is an integer number (24499125).

Almost surely, 2^129728422 is an apocalyptic number.

129728422 is a deficient number, since it is larger than the sum of its proper divisors (66264578).

129728422 is a wasteful number, since it uses less digits than its factorization.

129728422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466790.

The product of its digits is 32256, while the sum is 37.

The square root of 129728422 is about 11389.8385414368. The cubic root of 129728422 is about 506.2266972559.

The spelling of 129728422 in words is "one hundred twenty-nine million, seven hundred twenty-eight thousand, four hundred twenty-two".