129697428 has 48 divisors (see below), whose sum is σ = 357023744. Its totient is φ = 35860320.

The previous prime is 129697427. The next prime is 129697453. The reversal of 129697428 is 824796921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129697423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22300 + ... + 27507.

Almost surely, 2^129697428 is an apocalyptic number.

It is an amenable number.

129697428 is an abundant number, since it is smaller than the sum of its proper divisors (227326316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129697428 is a wasteful number, since it uses less digits than its factorization.

129697428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49852 (or 49850 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 129697428 is about 11388.4778614177. The cubic root of 129697428 is about 506.1863790802.

The spelling of 129697428 in words is "one hundred twenty-nine million, six hundred ninety-seven thousand, four hundred twenty-eight".