255686390 has 8 divisors (see below), whose sum is σ = 460235520. Its totient is φ = 102274552.

The previous prime is 255686381. The next prime is 255686393. The reversal of 255686390 is 93686552.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255686393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12784310 + ... + 12784329.

It is an arithmetic number, because the mean of its divisors is an integer number (57529440).

Almost surely, 2^255686390 is an apocalyptic number.

255686390 is a deficient number, since it is larger than the sum of its proper divisors (204549130).

255686390 is a wasteful number, since it uses less digits than its factorization.

255686390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25568646.

The product of its (nonzero) digits is 388800, while the sum is 44.

The square root of 255686390 is about 15990.1966842187. The cubic root of 255686390 is about 634.7010310647.

The spelling of 255686390 in words is "two hundred fifty-five million, six hundred eighty-six thousand, three hundred ninety".