129760740 has 72 divisors (see below), whose sum is σ = 396684288. Its totient is φ = 34332480.

The previous prime is 129760727. The next prime is 129760751. The reversal of 129760740 is 47067921.

It is a happy number.

129760740 is a `hidden beast` number, since 1 + 2 + 9 + 7 + 607 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 129760695 and 129760704.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20829 + ... + 26331.

It is an arithmetic number, because the mean of its divisors is an integer number (5509504).

Almost surely, 2^129760740 is an apocalyptic number.

129760740 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 129760740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198342144).

129760740 is an abundant number, since it is smaller than the sum of its proper divisors (266923548).

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

129760740 is a wasteful number, since it uses less digits than its factorization.

129760740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5649 (or 5644 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 129760740 is about 11391.2571738154. The cubic root of 129760740 is about 506.2687309028.

The spelling of 129760740 in words is "one hundred twenty-nine million, seven hundred sixty thousand, seven hundred forty".