128876780 has 12 divisors (see below), whose sum is σ = 270641280. Its totient is φ = 51550704.

The previous prime is 128876777. The next prime is 128876789. The reversal of 128876780 is 87678821.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (128876789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3221900 + ... + 3221939.

It is an arithmetic number, because the mean of its divisors is an integer number (22553440).

Almost surely, 2^128876780 is an apocalyptic number.

128876780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128876780 is an abundant number, since it is smaller than the sum of its proper divisors (141764500).

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

128876780 is a wasteful number, since it uses less digits than its factorization.

128876780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6443848 (or 6443846 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 47.

The square root of 128876780 is about 11352.3909375955. The cubic root of 128876780 is about 505.1165041793.

The spelling of 128876780 in words is "one hundred twenty-eight million, eight hundred seventy-six thousand, seven hundred eighty".