128266287 has 8 divisors (see below), whose sum is σ = 171074304. Its totient is φ = 85484568.

The previous prime is 128266277. The next prime is 128266297. The reversal of 128266287 is 782662821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128266277) and next prime (128266297).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128266287 - 2⁶ = 128266223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128266277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14088 + ... + 21330.

It is an arithmetic number, because the mean of its divisors is an integer number (21384288).

Almost surely, 2^128266287 is an apocalyptic number.

128266287 is a deficient number, since it is larger than the sum of its proper divisors (42808017).

128266287 is an equidigital number, since it uses as much as digits as its factorization.

128266287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13149.

The product of its digits is 129024, while the sum is 42.

The square root of 128266287 is about 11325.4707186942. The cubic root of 128266287 is about 504.3176576770.

The spelling of 128266287 in words is "one hundred twenty-eight million, two hundred sixty-six thousand, two hundred eighty-seven".