128890275 has 24 divisors (see below), whose sum is σ = 222366720. Its totient is φ = 65751840.

The previous prime is 128890273. The next prime is 128890283. The reversal of 128890275 is 572098821.

It is not a de Polignac number, because 128890275 - 2¹ = 128890273 is a prime.

It is a super-2 number, since 2×128890275² = 33225405979151250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128890271) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 35635 + ... + 39084.

It is an arithmetic number, because the mean of its divisors is an integer number (9265280).

Almost surely, 2^128890275 is an apocalyptic number.

128890275 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128890275 is a deficient number, since it is larger than the sum of its proper divisors (93476445).

128890275 is a wasteful number, since it uses less digits than its factorization.

128890275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74755 (or 74750 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 128890275 is about 11352.9852902221. The cubic root of 128890275 is about 505.1341342218.

The spelling of 128890275 in words is "one hundred twenty-eight million, eight hundred ninety thousand, two hundred seventy-five".