129670920 has 48 divisors (see below), whose sum is σ = 421431660. Its totient is φ = 34578816.

The previous prime is 129670909. The next prime is 129670949. The reversal of 129670920 is 29076921.

It can be written as a sum of positive squares in 2 ways, for example, as 125484804 + 4186116 = 11202^2 + 2046^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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 11 ways as a sum of consecutive naturals, for example, 179739 + ... + 180458.

Almost surely, 2^129670920 is an apocalyptic number.

129670920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129670920 is an abundant number, since it is smaller than the sum of its proper divisors (291760740).

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

129670920 is a wasteful number, since it uses less digits than its factorization.

129670920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360214 (or 360207 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 129670920 is about 11387.3139940901. The cubic root of 129670920 is about 506.1518913678.

The spelling of 129670920 in words is "one hundred twenty-nine million, six hundred seventy thousand, nine hundred twenty".