129663240 has 128 divisors (see below), whose sum is σ = 447759360. Its totient is φ = 29424384.

The previous prime is 129663229. The next prime is 129663293. The reversal of 129663240 is 42366921.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136447 + ... + 137393.

It is an arithmetic number, because the mean of its divisors is an integer number (3498120).

Almost surely, 2^129663240 is an apocalyptic number.

129663240 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 129663240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223879680).

129663240 is an abundant number, since it is smaller than the sum of its proper divisors (318096120).

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

129663240 is a wasteful number, since it uses less digits than its factorization.

129663240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131 (or 1127 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 129663240 is about 11386.9767717336. The cubic root of 129663240 is about 506.1418985766.

The spelling of 129663240 in words is "one hundred twenty-nine million, six hundred sixty-three thousand, two hundred forty".