129550780 has 24 divisors (see below), whose sum is σ = 274019760. Its totient is φ = 51446400.

The previous prime is 129550741. The next prime is 129550783. The reversal of 129550780 is 87055921.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129550783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20521 + ... + 26080.

It is an arithmetic number, because the mean of its divisors is an integer number (11417490).

Almost surely, 2^129550780 is an apocalyptic number.

129550780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129550780 is an abundant number, since it is smaller than the sum of its proper divisors (144468980).

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

129550780 is a wasteful number, since it uses less digits than its factorization.

129550780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46749 (or 46747 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 129550780 is about 11382.0376031711. The cubic root of 129550780 is about 505.9955266312.

The spelling of 129550780 in words is "one hundred twenty-nine million, five hundred fifty thousand, seven hundred eighty".