129036780 has 96 divisors (see below), whose sum is σ = 406425600. Its totient is φ = 33983424.

The previous prime is 129036767. The next prime is 129036811. The reversal of 129036780 is 87630921.

129036780 is a `hidden beast` number, since 1 + 290 + 367 + 8 + 0 = 666.

It is a super-3 number, since 3×129036780³ (a number of 25 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43381 + ... + 46259.

It is an arithmetic number, because the mean of its divisors is an integer number (4233600).

Almost surely, 2^129036780 is an apocalyptic number.

129036780 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 129036780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203212800).

129036780 is an abundant number, since it is smaller than the sum of its proper divisors (277388820).

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

129036780 is a wasteful number, since it uses less digits than its factorization.

129036780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980 (or 2972 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 129036780 is about 11359.4357254223. The cubic root of 129036780 is about 505.3254510984.

It can be divided in two parts, 12903 and 6780, that added together give a 9-th power (19683 = 3⁹).

The spelling of 129036780 in words is "one hundred twenty-nine million, thirty-six thousand, seven hundred eighty".