129707644 has 36 divisors (see below), whose sum is σ = 256278232. Its totient is φ = 57356640.

The previous prime is 129707609. The next prime is 129707657. The reversal of 129707644 is 446707921.

It is a junction number, because it is equal to n+sod(n) for n = 129707597 and 129707606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14287 + ... + 21529.

Almost surely, 2^129707644 is an apocalyptic number.

It is an amenable number.

129707644 is a deficient number, since it is larger than the sum of its proper divisors (126570588).

129707644 is a wasteful number, since it uses less digits than its factorization.

129707644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7306 (or 7293 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 129707644 is about 11388.9263760901. The cubic root of 129707644 is about 506.1996691517.

The spelling of 129707644 in words is "one hundred twenty-nine million, seven hundred seven thousand, six hundred forty-four".