129880769 has 8 divisors (see below), whose sum is σ = 134275680. Its totient is φ = 125548416.

The previous prime is 129880739. The next prime is 129880781. The reversal of 129880769 is 967088921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129880769 - 2²⁴ = 113103553 is a prime.

It is a super-2 number, since 2×129880769² = 33738028312062722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129880739) 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, 11399 + ... + 19740.

It is an arithmetic number, because the mean of its divisors is an integer number (16784460).

Almost surely, 2^129880769 is an apocalyptic number.

It is an amenable number.

129880769 is a deficient number, since it is larger than the sum of its proper divisors (4394911).

129880769 is an equidigital number, since it uses as much as digits as its factorization.

129880769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31279.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 129880769 is about 11396.5244263328. The cubic root of 129880769 is about 506.4247827322.

The spelling of 129880769 in words is "one hundred twenty-nine million, eight hundred eighty thousand, seven hundred sixty-nine".