128552778 has 16 divisors (see below), whose sum is σ = 285672960. Its totient is φ = 42850908.

The previous prime is 128552761. The next prime is 128552791. The reversal of 128552778 is 877255821.

128552778 is a `hidden beast` number, since 1 + 28 + 552 + 7 + 78 = 666.

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, 1190250 + ... + 1190357.

It is an arithmetic number, because the mean of its divisors is an integer number (17854560).

Almost surely, 2^128552778 is an apocalyptic number.

128552778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

128552778 is an abundant number, since it is smaller than the sum of its proper divisors (157120182).

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

128552778 is a wasteful number, since it uses less digits than its factorization.

128552778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380618 (or 2380612 counting only the distinct ones).

The product of its digits is 313600, while the sum is 45.

The square root of 128552778 is about 11338.1117475530. Note that the first 3 decimals coincide. The cubic root of 128552778 is about 504.6928537799.

The spelling of 128552778 in words is "one hundred twenty-eight million, five hundred fifty-two thousand, seven hundred seventy-eight".