129691072 has 28 divisors (see below), whose sum is σ = 294121840. Its totient is φ = 55581696.

The previous prime is 129691033. The next prime is 129691109. The reversal of 129691072 is 270196921.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144297 + ... + 145192.

Almost surely, 2^129691072 is an apocalyptic number.

It is an amenable number.

129691072 is an abundant number, since it is smaller than the sum of its proper divisors (164430768).

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

129691072 is an equidigital number, since it uses as much as digits as its factorization.

129691072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289508 (or 289498 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 129691072 is about 11388.1988040252. The cubic root of 129691072 is about 506.1781101596.

It can be divided in two parts, 12969 and 1072, that added together give a palindrome (14041).

The spelling of 129691072 in words is "one hundred twenty-nine million, six hundred ninety-one thousand, seventy-two".