67128255 has 12 divisors (see below), whose sum is σ = 116355720. Its totient is φ = 35801712.

The previous prime is 67128251. The next prime is 67128277. The reversal of 67128255 is 55282176.

It is a happy number.

It is not a de Polignac number, because 67128255 - 2² = 67128251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67128251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 745825 + ... + 745914.

It is an arithmetic number, because the mean of its divisors is an integer number (9696310).

Almost surely, 2^67128255 is an apocalyptic number.

67128255 is a deficient number, since it is larger than the sum of its proper divisors (49227465).

67128255 is a wasteful number, since it uses less digits than its factorization.

67128255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491750 (or 1491747 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 67128255 is about 8193.1834472322. The cubic root of 67128255 is about 406.4138059737.

The spelling of 67128255 in words is "sixty-seven million, one hundred twenty-eight thousand, two hundred fifty-five".