129256878 has 8 divisors (see below), whose sum is σ = 258513768. Its totient is φ = 43085624.

The previous prime is 129256861. The next prime is 129256879. The reversal of 129256878 is 878652921.

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

129256878 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129256879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10771401 + ... + 10771412.

It is an arithmetic number, because the mean of its divisors is an integer number (32314221).

Almost surely, 2^129256878 is an apocalyptic number.

129256878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

129256878 is a wasteful number, since it uses less digits than its factorization.

129256878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21542818.

The product of its digits is 483840, while the sum is 48.

The square root of 129256878 is about 11369.1194909720. The cubic root of 129256878 is about 505.6125990583.

The spelling of 129256878 in words is "one hundred twenty-nine million, two hundred fifty-six thousand, eight hundred seventy-eight".