128678250 has 32 divisors (see below), whose sum is σ = 321182784. Its totient is φ = 34314000.

The previous prime is 128678239. The next prime is 128678309. The reversal of 128678250 is 52876821.

It is a junction number, because it is equal to n+sod(n) for n = 128678199 and 128678208.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 85036 + ... + 86535.

It is an arithmetic number, because the mean of its divisors is an integer number (10036962).

Almost surely, 2^128678250 is an apocalyptic number.

128678250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128678250 is an abundant number, since it is smaller than the sum of its proper divisors (192504534).

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

128678250 is a wasteful number, since it uses less digits than its factorization.

128678250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171591 (or 171581 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 128678250 is about 11343.6435945423. The cubic root of 128678250 is about 504.8569996700.

The spelling of 128678250 in words is "one hundred twenty-eight million, six hundred seventy-eight thousand, two hundred fifty".