128420275 has 6 divisors (see below), whose sum is σ = 159241172. Its totient is φ = 102736200.

The previous prime is 128420263. The next prime is 128420287. The reversal of 128420275 is 572024821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128420263) and next prime (128420287).

It is not a de Polignac number, because 128420275 - 2¹³ = 128412083 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2568381 + ... + 2568430.

Almost surely, 2^128420275 is an apocalyptic number.

128420275 is a deficient number, since it is larger than the sum of its proper divisors (30820897).

128420275 is an equidigital number, since it uses as much as digits as its factorization.

128420275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5136821 (or 5136816 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 128420275 is about 11332.2669841475. The cubic root of 128420275 is about 504.5193937493.

The spelling of 128420275 in words is "one hundred twenty-eight million, four hundred twenty thousand, two hundred seventy-five".