128631250 has 48 divisors (see below), whose sum is σ = 263233152. Its totient is φ = 46750000.

The previous prime is 128631221. The next prime is 128631263. The reversal of 128631250 is 52136821.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67815 + ... + 69685.

It is an arithmetic number, because the mean of its divisors is an integer number (5484024).

Almost surely, 2^128631250 is an apocalyptic number.

128631250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128631250 is an abundant number, since it is smaller than the sum of its proper divisors (134601902).

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

128631250 is an equidigital number, since it uses as much as digits as its factorization.

128631250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909 (or 1889 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 128631250 is about 11341.5717605630. The cubic root of 128631250 is about 504.7955254931.

It can be divided in two parts, 128631 and 250, that added together give a square (128881 = 359²).

The spelling of 128631250 in words is "one hundred twenty-eight million, six hundred thirty-one thousand, two hundred fifty".