129749880 has 128 divisors (see below), whose sum is σ = 432875520. Its totient is φ = 30896640.

The previous prime is 129749863. The next prime is 129749881. The reversal of 129749880 is 88947921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129749881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47019 + ... + 49701.

It is an arithmetic number, because the mean of its divisors is an integer number (3381840).

Almost surely, 2^129749880 is an apocalyptic number.

129749880 is a gapful number since it is divisible by the number (10) 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 129749880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216437760).

129749880 is an abundant number, since it is smaller than the sum of its proper divisors (303125640).

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

129749880 is a wasteful number, since it uses less digits than its factorization.

129749880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2741 (or 2737 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 129749880 is about 11390.7804824779. The cubic root of 129749880 is about 506.2546068778.

The spelling of 129749880 in words is "one hundred twenty-nine million, seven hundred forty-nine thousand, eight hundred eighty".