129694656 has 168 divisors, whose sum is σ = 425403264. Its totient is φ = 34145280.

The previous prime is 129694637. The next prime is 129694661. The reversal of 129694656 is 656496921.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 226851 + ... + 227421.

Almost surely, 2^129694656 is an apocalyptic number.

129694656 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 129694656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212701632).

129694656 is an abundant number, since it is smaller than the sum of its proper divisors (295708608).

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

129694656 is a wasteful number, since it uses less digits than its factorization.

129694656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619 (or 596 counting only the distinct ones).

The product of its digits is 699840, while the sum is 48.

The square root of 129694656 is about 11388.3561588141. The cubic root of 129694656 is about 506.1827728441.

The spelling of 129694656 in words is "one hundred twenty-nine million, six hundred ninety-four thousand, six hundred fifty-six".