129680776 has 32 divisors (see below), whose sum is σ = 261914400. Its totient is φ = 59996160.

The previous prime is 129680773. The next prime is 129680783. The reversal of 129680776 is 677086921.

It is a happy number.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (129680773) 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, 3385 + ... + 16456.

It is an arithmetic number, because the mean of its divisors is an integer number (8184825).

Almost surely, 2^129680776 is an apocalyptic number.

It is an amenable number.

129680776 is an abundant number, since it is smaller than the sum of its proper divisors (132233624).

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

129680776 is a wasteful number, since it uses less digits than its factorization.

129680776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19909 (or 19905 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 129680776 is about 11387.7467481500. The cubic root of 129680776 is about 506.1647148717.

The spelling of 129680776 in words is "one hundred twenty-nine million, six hundred eighty thousand, seven hundred seventy-six".