284640213 has 64 divisors (see below), whose sum is σ = 462470400. Its totient is φ = 153446400.

The previous prime is 284640199. The next prime is 284640221. The reversal of 284640213 is 312046482.

It is not a de Polignac number, because 284640213 - 2¹⁸ = 284378069 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (284640253) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1910263 + ... + 1910411.

It is an arithmetic number, because the mean of its divisors is an integer number (7226100).

Almost surely, 2^284640213 is an apocalyptic number.

It is an amenable number.

284640213 is a deficient number, since it is larger than the sum of its proper divisors (177830187).

284640213 is a wasteful number, since it uses less digits than its factorization.

284640213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 284640213 is about 16871.2836796730. The cubic root of 284640213 is about 657.8073956717.

Adding to 284640213 its reverse (312046482), we get a palindrome (596686695).

The spelling of 284640213 in words is "two hundred eighty-four million, six hundred forty thousand, two hundred thirteen".