284881890 has 64 divisors (see below), whose sum is σ = 702172800. Its totient is φ = 73941504.

The previous prime is 284881867. The next prime is 284881931. The reversal of 284881890 is 98188482.

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, 220366 + ... + 221654.

It is an arithmetic number, because the mean of its divisors is an integer number (10971450).

Almost surely, 2^284881890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 284881890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (351086400).

284881890 is an abundant number, since it is smaller than the sum of its proper divisors (417290910).

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

284881890 is a wasteful number, since it uses less digits than its factorization.

284881890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491.

The product of its (nonzero) digits is 294912, while the sum is 48.

The square root of 284881890 is about 16878.4445373381. Note that the first 3 decimals coincide. The cubic root of 284881890 is about 657.9935159482.

The spelling of 284881890 in words is "two hundred eighty-four million, eight hundred eighty-one thousand, eight hundred ninety".