284778213 has 16 divisors (see below), whose sum is σ = 400048320. Its totient is φ = 179698176.

The previous prime is 284778209. The next prime is 284778223. The reversal of 284778213 is 312877482.

It is not a de Polignac number, because 284778213 - 2² = 284778209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (284778223) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 113731 + ... + 116207.

It is an arithmetic number, because the mean of its divisors is an integer number (25003020).

Almost surely, 2^284778213 is an apocalyptic number.

It is an amenable number.

284778213 is a deficient number, since it is larger than the sum of its proper divisors (115270107).

284778213 is a wasteful number, since it uses less digits than its factorization.

284778213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4516.

The product of its digits is 150528, while the sum is 42.

The square root of 284778213 is about 16875.3729736560. The cubic root of 284778213 is about 657.9136851207.

The spelling of 284778213 in words is "two hundred eighty-four million, seven hundred seventy-eight thousand, two hundred thirteen".