255690477828 has 18 divisors (see below), whose sum is σ = 646328707934. Its totient is φ = 85230159264.

The previous prime is 255690477817. The next prime is 255690477901. The reversal of 255690477828 is 828774096552.

255690477828 is a `hidden beast` number, since 2 + 5 + 56 + 90 + 477 + 8 + 28 = 666.

It can be written as a sum of positive squares in only one way, i.e., 252518310144 + 3172167684 = 502512^2 + 56322^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3551256601 + ... + 3551256672.

Almost surely, 2^255690477828 is an apocalyptic number.

It is an amenable number.

255690477828 is an abundant number, since it is smaller than the sum of its proper divisors (390638230106).

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

255690477828 is a wasteful number, since it uses less digits than its factorization.

255690477828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7102513283 (or 7102513278 counting only the distinct ones).

The product of its (nonzero) digits is 67737600, while the sum is 63.

The spelling of 255690477828 in words is "two hundred fifty-five billion, six hundred ninety million, four hundred seventy-seven thousand, eight hundred twenty-eight".