128899250 has 16 divisors (see below), whose sum is σ = 241299864. Its totient is φ = 51559600.

The previous prime is 128899207. The next prime is 128899261. The reversal of 128899250 is 52998821.

It can be written as a sum of positive squares in 4 ways, for example, as 63984001 + 64915249 = 7999^2 + 8057^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257549 + ... + 258048.

Almost surely, 2^128899250 is an apocalyptic number.

128899250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128899250 is a deficient number, since it is larger than the sum of its proper divisors (112400614).

128899250 is an equidigital number, since it uses as much as digits as its factorization.

128899250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515614 (or 515604 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 128899250 is about 11353.3805538262. The cubic root of 128899250 is about 505.1458585965.

The spelling of 128899250 in words is "one hundred twenty-eight million, eight hundred ninety-nine thousand, two hundred fifty".