129780788 has 24 divisors (see below), whose sum is σ = 242109000. Its totient is φ = 60658688.

The previous prime is 129780689. The next prime is 129780799. The reversal of 129780788 is 887087921.

It is a happy number.

129780788 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6615184 + 123165604 = 2572^2 + 11098^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3728 + ... + 16536.

It is an arithmetic number, because the mean of its divisors is an integer number (10087875).

Almost surely, 2^129780788 is an apocalyptic number.

It is an amenable number.

129780788 is a deficient number, since it is larger than the sum of its proper divisors (112328212).

129780788 is a wasteful number, since it uses less digits than its factorization.

129780788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12979 (or 12977 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 50.

The square root of 129780788 is about 11392.1371129389. The cubic root of 129780788 is about 506.2948023551.

The spelling of 129780788 in words is "one hundred twenty-nine million, seven hundred eighty thousand, seven hundred eighty-eight".