255091638 has 32 divisors (see below), whose sum is σ = 522101376. Its totient is φ = 83066688.

The previous prime is 255091637. The next prime is 255091649. The reversal of 255091638 is 836190552.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 255091596 and 255091605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255091637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44145 + ... + 49587.

It is an arithmetic number, because the mean of its divisors is an integer number (16315668).

Almost surely, 2^255091638 is an apocalyptic number.

255091638 is an abundant number, since it is smaller than the sum of its proper divisors (267009738).

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

255091638 is a wasteful number, since it uses less digits than its factorization.

255091638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5628.

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 255091638 is about 15971.5884620159. The cubic root of 255091638 is about 634.2085230626.

The spelling of 255091638 in words is "two hundred fifty-five million, ninety-one thousand, six hundred thirty-eight".