128251040 has 24 divisors (see below), whose sum is σ = 302993460. Its totient is φ = 51300352.

The previous prime is 128251037. The next prime is 128251087. The reversal of 128251040 is 40152821.

It can be written as a sum of positive squares in 2 ways, for example, as 124456336 + 3794704 = 11156^2 + 1948^2 .

It is a super-2 number, since 2×128251040² = 32896658522163200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128250997 and 128251015.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400625 + ... + 400944.

Almost surely, 2^128251040 is an apocalyptic number.

128251040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128251040 is an abundant number, since it is smaller than the sum of its proper divisors (174742420).

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

128251040 is an equidigital number, since it uses as much as digits as its factorization.

128251040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801584 (or 801576 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 128251040 is about 11324.7975699347. The cubic root of 128251040 is about 504.2976741563.

The spelling of 128251040 in words is "one hundred twenty-eight million, two hundred fifty-one thousand, forty".