128456775 has 18 divisors (see below), whose sum is σ = 230080760. Its totient is φ = 68510160.

The previous prime is 128456753. The next prime is 128456807. The reversal of 128456775 is 577654821.

128456775 is a `hidden beast` number, since 1 + 2 + 84 + 567 + 7 + 5 = 666.

It is not a de Polignac number, because 128456775 - 2¹⁶ = 128391239 is a prime.

It is a super-2 number, since 2×128456775² = 33002286086801250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 128456775.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 285235 + ... + 285684.

Almost surely, 2^128456775 is an apocalyptic number.

128456775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128456775 is a deficient number, since it is larger than the sum of its proper divisors (101623985).

128456775 is a wasteful number, since it uses less digits than its factorization.

128456775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570935 (or 570927 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 128456775 is about 11333.8773153762. The cubic root of 128456775 is about 504.5671878988.

The spelling of 128456775 in words is "one hundred twenty-eight million, four hundred fifty-six thousand, seven hundred seventy-five".