84705813 has 6 divisors (see below), whose sum is σ = 122352854. Its totient is φ = 56470536.

The previous prime is 84705809. The next prime is 84705821. The reversal of 84705813 is 31850748.

84705813 is a `hidden beast` number, since 8 + 4 + 70 + 581 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 57426084 + 27279729 = 7578^2 + 5223^2 .

It is not a de Polignac number, because 84705813 - 2² = 84705809 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 (84705833) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4705870 + ... + 4705887.

Almost surely, 2^84705813 is an apocalyptic number.

It is an amenable number.

84705813 is a deficient number, since it is larger than the sum of its proper divisors (37647041).

84705813 is a wasteful number, since it uses less digits than its factorization.

84705813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9411763 (or 9411760 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 84705813 is about 9203.5760984522. The cubic root of 84705813 is about 439.1751298537.

The spelling of 84705813 in words is "eighty-four million, seven hundred five thousand, eight hundred thirteen".