128756780 has 12 divisors (see below), whose sum is σ = 270389280. Its totient is φ = 51502704.

The previous prime is 128756777. The next prime is 128756801. The reversal of 128756780 is 87657821.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3218900 + ... + 3218939.

It is an arithmetic number, because the mean of its divisors is an integer number (22532440).

Almost surely, 2^128756780 is an apocalyptic number.

128756780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128756780 is an abundant number, since it is smaller than the sum of its proper divisors (141632500).

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

128756780 is a wasteful number, since it uses less digits than its factorization.

128756780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6437848 (or 6437846 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 44.

The square root of 128756780 is about 11347.1044764733. The cubic root of 128756780 is about 504.9596804721.

The spelling of 128756780 in words is "one hundred twenty-eight million, seven hundred fifty-six thousand, seven hundred eighty".