129657696 has 96 divisors (see below), whose sum is σ = 395474688. Its totient is φ = 36426240.

The previous prime is 129657679. The next prime is 129657707. The reversal of 129657696 is 696756921.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×129657696² = 33622236264056832, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39411 + ... + 42573.

It is an arithmetic number, because the mean of its divisors is an integer number (4119528).

Almost surely, 2^129657696 is an apocalyptic number.

129657696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129657696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197737344).

129657696 is an abundant number, since it is smaller than the sum of its proper divisors (265816992).

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

129657696 is a wasteful number, since it uses less digits than its factorization.

129657696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3244 (or 3236 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 51.

The square root of 129657696 is about 11386.7333331382. The cubic root of 129657696 is about 506.1346847853.

The spelling of 129657696 in words is "one hundred twenty-nine million, six hundred fifty-seven thousand, six hundred ninety-six".