129075736 has 8 divisors (see below), whose sum is σ = 242017020. Its totient is φ = 64537864.

The previous prime is 129075733. The next prime is 129075757. The reversal of 129075736 is 637570921.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129075731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8067226 + ... + 8067241.

Almost surely, 2^129075736 is an apocalyptic number.

It is an amenable number.

129075736 is a deficient number, since it is larger than the sum of its proper divisors (112941284).

129075736 is a wasteful number, since it uses less digits than its factorization.

129075736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16134473 (or 16134469 counting only the distinct ones).

The product of its (nonzero) digits is 79380, while the sum is 40.

The square root of 129075736 is about 11361.1502938743. The cubic root of 129075736 is about 505.3762983003.

The spelling of 129075736 in words is "one hundred twenty-nine million, seventy-five thousand, seven hundred thirty-six".