255555690 has 64 divisors (see below), whose sum is σ = 665473536. Its totient is φ = 62433792.

The previous prime is 255555683. The next prime is 255555709. The reversal of 255555690 is 96555552.

It is a super-2 number, since 2×255555690² = 130617421382752200, which contains 22 as substring.

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 in 31 ways as a sum of consecutive naturals, for example, 51039 + ... + 55821.

It is an arithmetic number, because the mean of its divisors is an integer number (10398024).

Almost surely, 2^255555690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255555690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332736768).

255555690 is an abundant number, since it is smaller than the sum of its proper divisors (409917846).

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

255555690 is a wasteful number, since it uses less digits than its factorization.

255555690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4943.

The product of its (nonzero) digits is 337500, while the sum is 42.

The square root of 255555690 is about 15986.1092827492. The cubic root of 255555690 is about 634.5928652714.

The spelling of 255555690 in words is "two hundred fifty-five million, five hundred fifty-five thousand, six hundred ninety".