284138856 has 96 divisors (see below), whose sum is σ = 796952520. Its totient is φ = 91392000.

The previous prime is 284138843. The next prime is 284138861. The reversal of 284138856 is 658831482.

It can be written as a sum of positive squares in 4 ways, for example, as 236113956 + 48024900 = 15366^2 + 6930^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 297676 + ... + 298628.

Almost surely, 2^284138856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 284138856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (398476260).

284138856 is an abundant number, since it is smaller than the sum of its proper divisors (512813664).

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

284138856 is a wasteful number, since it uses less digits than its factorization.

284138856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107 (or 1100 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The square root of 284138856 is about 16856.4188367518. The cubic root of 284138856 is about 657.4209544167.

The spelling of 284138856 in words is "two hundred eighty-four million, one hundred thirty-eight thousand, eight hundred fifty-six".