128280550 has 12 divisors (see below), whose sum is σ = 238601916. Its totient is φ = 51312200.

The previous prime is 128280539. The next prime is 128280557. The reversal of 128280550 is 55082821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128280557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1282756 + ... + 1282855.

It is an arithmetic number, because the mean of its divisors is an integer number (19883493).

Almost surely, 2^128280550 is an apocalyptic number.

128280550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128280550 is a deficient number, since it is larger than the sum of its proper divisors (110321366).

128280550 is a wasteful number, since it uses less digits than its factorization.

128280550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2565623 (or 2565618 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 128280550 is about 11326.1003880418. The cubic root of 128280550 is about 504.3363500820.

The spelling of 128280550 in words is "one hundred twenty-eight million, two hundred eighty thousand, five hundred fifty".