128254990 has 16 divisors (see below), whose sum is σ = 231046848. Its totient is φ = 51260256.

The previous prime is 128254981. The next prime is 128254991. The reversal of 128254990 is 99452821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128254991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9724 + ... + 18736.

It is an arithmetic number, because the mean of its divisors is an integer number (14440428).

Almost surely, 2^128254990 is an apocalyptic number.

128254990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128254990 is a deficient number, since it is larger than the sum of its proper divisors (102791858).

128254990 is a wasteful number, since it uses less digits than its factorization.

128254990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10443.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 128254990 is about 11324.9719646452. The cubic root of 128254990 is about 504.3028513862.

The spelling of 128254990 in words is "one hundred twenty-eight million, two hundred fifty-four thousand, nine hundred ninety".