129878240 has 96 divisors (see below), whose sum is σ = 331490880. Its totient is φ = 47939584.

The previous prime is 129878239. The next prime is 129878299. The reversal of 129878240 is 42878921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106112 + ... + 107328.

It is an arithmetic number, because the mean of its divisors is an integer number (3453030).

Almost surely, 2^129878240 is an apocalyptic number.

129878240 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 129878240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165745440).

129878240 is an abundant number, since it is smaller than the sum of its proper divisors (201612640).

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

129878240 is a wasteful number, since it uses less digits than its factorization.

129878240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284 (or 1276 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 129878240 is about 11396.4134709127. The cubic root of 129878240 is about 506.4214957262.

The spelling of 129878240 in words is "one hundred twenty-nine million, eight hundred seventy-eight thousand, two hundred forty".