128955550 has 12 divisors (see below), whose sum is σ = 239857416. Its totient is φ = 51582200.

The previous prime is 128955539. The next prime is 128955551. The reversal of 128955550 is 55559821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128955551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1289506 + ... + 1289605.

It is an arithmetic number, because the mean of its divisors is an integer number (19988118).

Almost surely, 2^128955550 is an apocalyptic number.

128955550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128955550 is a deficient number, since it is larger than the sum of its proper divisors (110901866).

128955550 is a wasteful number, since it uses less digits than its factorization.

128955550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2579123 (or 2579118 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 40.

The square root of 128955550 is about 11355.8597208666. The cubic root of 128955550 is about 505.2193929583.

The spelling of 128955550 in words is "one hundred twenty-eight million, nine hundred fifty-five thousand, five hundred fifty".