255168720 has 60 divisors (see below), whose sum is σ = 856944036. Its totient is φ = 68044800.

The previous prime is 255168703. The next prime is 255168733. The reversal of 255168720 is 27861552.

It is a happy number.

255168720 is a `hidden beast` number, since 2 + 551 + 6 + 87 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 33039504 + 222129216 = 5748^2 + 14904^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×255168720² = 130222151332876800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 176481 + ... + 177920.

Almost surely, 2^255168720 is an apocalyptic number.

255168720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255168720 is an abundant number, since it is smaller than the sum of its proper divisors (601775316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255168720 is a wasteful number, since it uses less digits than its factorization.

255168720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354420 (or 354411 counting only the distinct ones).

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

The square root of 255168720 is about 15974.0013772380. The cubic root of 255168720 is about 634.2723970212.

The spelling of 255168720 in words is "two hundred fifty-five million, one hundred sixty-eight thousand, seven hundred twenty".