129552740 has 12 divisors (see below), whose sum is σ = 272060796. Its totient is φ = 51821088.

The previous prime is 129552737. The next prime is 129552749. The reversal of 129552740 is 47255921.

It can be written as a sum of positive squares in 2 ways, for example, as 91087936 + 38464804 = 9544^2 + 6202^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 129552740.

It is not an unprimeable number, because it can be changed into a prime (129552749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3238799 + ... + 3238838.

It is an arithmetic number, because the mean of its divisors is an integer number (22671733).

Almost surely, 2^129552740 is an apocalyptic number.

129552740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129552740 is an abundant number, since it is smaller than the sum of its proper divisors (142508056).

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

129552740 is a wasteful number, since it uses less digits than its factorization.

129552740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6477646 (or 6477644 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 129552740 is about 11382.1237034220. The cubic root of 129552740 is about 505.9980783879.

The spelling of 129552740 in words is "one hundred twenty-nine million, five hundred fifty-two thousand, seven hundred forty".