255639998 has 4 divisors (see below), whose sum is σ = 383460000. Its totient is φ = 127819998.

The previous prime is 255639983. The next prime is 255640001. The reversal of 255639998 is 899936552.

255639998 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63909998 + ... + 63910001.

It is an arithmetic number, because the mean of its divisors is an integer number (95865000).

Almost surely, 2^255639998 is an apocalyptic number.

255639998 is a deficient number, since it is larger than the sum of its proper divisors (127820002).

255639998 is a wasteful number, since it uses less digits than its factorization.

255639998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127820001.

The product of its digits is 5248800, while the sum is 56.

The square root of 255639998 is about 15988.7459795945. The cubic root of 255639998 is about 634.6626418082.

The spelling of 255639998 in words is "two hundred fifty-five million, six hundred thirty-nine thousand, nine hundred ninety-eight".