505857990 has 32 divisors (see below), whose sum is σ = 1324429056. Its totient is φ = 122632160.

The previous prime is 505857971. The next prime is 505858027. The reversal of 505857990 is 99758505.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 766122 + ... + 766781.

It is an arithmetic number, because the mean of its divisors is an integer number (41388408).

Almost surely, 2^505857990 is an apocalyptic number.

505857990 is an abundant number, since it is smaller than the sum of its proper divisors (818571066).

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

505857990 is a wasteful number, since it uses less digits than its factorization.

505857990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532924.

The product of its (nonzero) digits is 567000, while the sum is 48.

The square root of 505857990 is about 22491.2869796284. The cubic root of 505857990 is about 796.7881588104.

The spelling of 505857990 in words is "five hundred five million, eight hundred fifty-seven thousand, nine hundred ninety".