84364813 has 4 divisors (see below), whose sum is σ = 90854428. Its totient is φ = 77875200.

The previous prime is 84364793. The next prime is 84364837. The reversal of 84364813 is 31846348.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47361924 + 37002889 = 6882^2 + 6083^2 .

It is a de Polignac number, because none of the positive numbers 2^k-84364813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84364913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3244788 + ... + 3244813.

It is an arithmetic number, because the mean of its divisors is an integer number (22713607).

Almost surely, 2^84364813 is an apocalyptic number.

It is an amenable number.

84364813 is a deficient number, since it is larger than the sum of its proper divisors (6489615).

84364813 is a wasteful number, since it uses less digits than its factorization.

84364813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6489614.

The product of its digits is 55296, while the sum is 37.

The square root of 84364813 is about 9185.0320086541. The cubic root of 84364813 is about 438.5850084845.

It can be divided in two parts, 843 and 64813, that added together give a palindrome (65656).

The spelling of 84364813 in words is "eighty-four million, three hundred sixty-four thousand, eight hundred thirteen".