129055590 has 48 divisors (see below), whose sum is σ = 339026688. Its totient is φ = 34057728.

The previous prime is 129055571. The next prime is 129055603. The reversal of 129055590 is 95550921.

129055590 is a `hidden beast` number, since 12 + 9 + 0 + 55 + 590 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1339 + ... + 16121.

It is an arithmetic number, because the mean of its divisors is an integer number (7063056).

Almost surely, 2^129055590 is an apocalyptic number.

129055590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129055590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169513344).

129055590 is an abundant number, since it is smaller than the sum of its proper divisors (209971098).

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

129055590 is a wasteful number, since it uses less digits than its factorization.

129055590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14893 (or 14890 counting only the distinct ones).

The product of its (nonzero) digits is 20250, while the sum is 36.

The square root of 129055590 is about 11360.2636413069. The cubic root of 129055590 is about 505.3500040719.

The spelling of 129055590 in words is "one hundred twenty-nine million, fifty-five thousand, five hundred ninety".