8778213 has 40 divisors (see below), whose sum is σ = 14069880. Its totient is φ = 5443200.

The previous prime is 8778191. The next prime is 8778241. The reversal of 8778213 is 3128778.

It can be written as a sum of positive squares in 4 ways, for example, as 5602689 + 3175524 = 2367^2 + 1782^2 .

It is not a de Polignac number, because 8778213 - 2¹⁰ = 8777189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8778293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 86863 + ... + 86963.

It is an arithmetic number, because the mean of its divisors is an integer number (351747).

Almost surely, 2^8778213 is an apocalyptic number.

It is an amenable number.

8778213 is a deficient number, since it is larger than the sum of its proper divisors (5291667).

8778213 is a wasteful number, since it uses less digits than its factorization.

8778213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179 (or 170 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 8778213 is about 2962.8049210166. The cubic root of 8778213 is about 206.2855013269.

The spelling of 8778213 in words is "eight million, seven hundred seventy-eight thousand, two hundred thirteen".