129765090 has 64 divisors (see below), whose sum is σ = 383314176. Its totient is φ = 27378432.

The previous prime is 129765071. The next prime is 129765091. The reversal of 129765090 is 90567921.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (129765091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21037 + ... + 26496.

It is an arithmetic number, because the mean of its divisors is an integer number (5989284).

Almost surely, 2^129765090 is an apocalyptic number.

129765090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129765090 is an abundant number, since it is smaller than the sum of its proper divisors (253549086).

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

129765090 is a wasteful number, since it uses less digits than its factorization.

129765090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47563.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 129765090 is about 11391.4481081204. The cubic root of 129765090 is about 506.2743880950.

The spelling of 129765090 in words is "one hundred twenty-nine million, seven hundred sixty-five thousand, ninety".