129280788 has 288 divisors, whose sum is σ = 443555840. Its totient is φ = 30792960.

The previous prime is 129280787. The next prime is 129280799. The reversal of 129280788 is 887082921.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129280787) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1929531 + ... + 1929597.

Almost surely, 2^129280788 is an apocalyptic number.

129280788 is a gapful number since it is divisible by the number (18) 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 129280788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221777920).

129280788 is an abundant number, since it is smaller than the sum of its proper divisors (314275052).

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

129280788 is a wasteful number, since it uses less digits than its factorization.

129280788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 129280788 is about 11370.1709749678. The cubic root of 129280788 is about 505.6437732908.

The spelling of 129280788 in words is "one hundred twenty-nine million, two hundred eighty thousand, seven hundred eighty-eight".