255018990 has 16 divisors (see below), whose sum is σ = 612045648. Its totient is φ = 68005056.

The previous prime is 255018977. The next prime is 255018997. The reversal of 255018990 is 99810552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255018997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4250287 + ... + 4250346.

It is an arithmetic number, because the mean of its divisors is an integer number (38252853).

Almost surely, 2^255018990 is an apocalyptic number.

255018990 is an abundant number, since it is smaller than the sum of its proper divisors (357026658).

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

255018990 is a wasteful number, since it uses less digits than its factorization.

255018990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8500643.

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 255018990 is about 15969.3140115661. The cubic root of 255018990 is about 634.1483115563.

The spelling of 255018990 in words is "two hundred fifty-five million, eighteen thousand, nine hundred ninety".