128775250 has 32 divisors (see below), whose sum is σ = 241802496. Its totient is φ = 51353200.

The previous prime is 128775233. The next prime is 128775307. The reversal of 128775250 is 52577821.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116199 + ... + 117301.

It is an arithmetic number, because the mean of its divisors is an integer number (7556328).

Almost surely, 2^128775250 is an apocalyptic number.

128775250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128775250 is a deficient number, since it is larger than the sum of its proper divisors (113027246).

128775250 is a wasteful number, since it uses less digits than its factorization.

128775250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1587 (or 1577 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 37.

The square root of 128775250 is about 11347.9183113027. The cubic root of 128775250 is about 504.9838245971.

The spelling of 128775250 in words is "one hundred twenty-eight million, seven hundred seventy-five thousand, two hundred fifty".