128878780 has 24 divisors (see below), whose sum is σ = 279377280. Its totient is φ = 49888320.

The previous prime is 128878769. The next prime is 128878793. The reversal of 128878780 is 87878821.

It is a congruent number.

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, 103315 + ... + 104554.

It is an arithmetic number, because the mean of its divisors is an integer number (11640720).

Almost surely, 2^128878780 is an apocalyptic number.

128878780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128878780 is an abundant number, since it is smaller than the sum of its proper divisors (150498500).

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

128878780 is a wasteful number, since it uses less digits than its factorization.

128878780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207909 (or 207907 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 49.

The square root of 128878780 is about 11352.4790244246. The cubic root of 128878780 is about 505.1191170828.

The spelling of 128878780 in words is "one hundred twenty-eight million, eight hundred seventy-eight thousand, seven hundred eighty".