128708780 has 24 divisors (see below), whose sum is σ = 274722000. Its totient is φ = 50639040.

The previous prime is 128708771. The next prime is 128708791. The reversal of 128708780 is 87807821.

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, 51530 + ... + 53969.

It is an arithmetic number, because the mean of its divisors is an integer number (11446750).

Almost surely, 2^128708780 is an apocalyptic number.

128708780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128708780 is an abundant number, since it is smaller than the sum of its proper divisors (146013220).

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

128708780 is a wasteful number, since it uses less digits than its factorization.

128708780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105569 (or 105567 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 41.

The square root of 128708780 is about 11344.9892022866. The cubic root of 128708780 is about 504.8969237064.

The spelling of 128708780 in words is "one hundred twenty-eight million, seven hundred eight thousand, seven hundred eighty".