129320402776 has 32 divisors (see below), whose sum is σ = 252268462080. Its totient is φ = 62081661600.

The previous prime is 129320402711. The next prime is 129320402831. The reversal of 129320402776 is 677204023921.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2021470 + ... + 2084461.

It is an arithmetic number, because the mean of its divisors is an integer number (7883389440).

Almost surely, 2^129320402776 is an apocalyptic number.

It is an amenable number.

129320402776 is a deficient number, since it is larger than the sum of its proper divisors (122948059304).

129320402776 is a wasteful number, since it uses less digits than its factorization.

129320402776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4106095 (or 4106091 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 43.

The spelling of 129320402776 in words is "one hundred twenty-nine billion, three hundred twenty million, four hundred two thousand, seven hundred seventy-six".