129780215796 has 48 divisors (see below), whose sum is σ = 377542448640. Its totient is φ = 33709146720.

The previous prime is 129780215723. The next prime is 129780215819. The reversal of 129780215796 is 697512087921.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70226466 + ... + 70228313.

It is an arithmetic number, because the mean of its divisors is an integer number (7865467680).

Almost surely, 2^129780215796 is an apocalyptic number.

It is an amenable number.

129780215796 is an abundant number, since it is smaller than the sum of its proper divisors (247762232844).

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

129780215796 is a wasteful number, since it uses less digits than its factorization.

129780215796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140454804 (or 140454802 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 57.

The spelling of 129780215796 in words is "one hundred twenty-nine billion, seven hundred eighty million, two hundred fifteen thousand, seven hundred ninety-six".