255998690 has 16 divisors (see below), whose sum is σ = 461506680. Its totient is φ = 102241920.

The previous prime is 255998683. The next prime is 255998753. The reversal of 255998690 is 96899552.

It is a happy number.

255998690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 173896969 + 82101721 = 13187^2 + 9061^2 .

It is a super-2 number, since 2×255998690² = 131070658563432200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12755 + ... + 25974.

Almost surely, 2^255998690 is an apocalyptic number.

255998690 is a deficient number, since it is larger than the sum of its proper divisors (205507990).

255998690 is a wasteful number, since it uses less digits than its factorization.

255998690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39397.

The product of its (nonzero) digits is 1749600, while the sum is 53.

The square root of 255998690 is about 15999.9590624476. The cubic root of 255998690 is about 634.9593377149.

The spelling of 255998690 in words is "two hundred fifty-five million, nine hundred ninety-eight thousand, six hundred ninety".