128567655 has 24 divisors (see below), whose sum is σ = 231106512. Its totient is φ = 68568768.

The previous prime is 128567653. The next prime is 128567657. The reversal of 128567655 is 556765821.

128567655 is a `hidden beast` number, since 1 + 28 + 567 + 65 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (128567653) and next prime (128567657).

It is not a de Polignac number, because 128567655 - 2¹ = 128567653 is a prime.

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 128567655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128567653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51694 + ... + 54123.

It is an arithmetic number, because the mean of its divisors is an integer number (9629438).

Almost surely, 2^128567655 is an apocalyptic number.

128567655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128567655 is a deficient number, since it is larger than the sum of its proper divisors (102538857).

128567655 is an equidigital number, since it uses as much as digits as its factorization.

128567655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105837 (or 105825 counting only the distinct ones).

The product of its digits is 504000, while the sum is 45.

The square root of 128567655 is about 11338.7677901966. The cubic root of 128567655 is about 504.7123218565.

The spelling of 128567655 in words is "one hundred twenty-eight million, five hundred sixty-seven thousand, six hundred fifty-five".