83215818 has 36 divisors (see below), whose sum is σ = 209740050. Its totient is φ = 23775696.

The previous prime is 83215813. The next prime is 83215823. The reversal of 83215818 is 81851238.

It is an interprime number because it is at equal distance from previous prime (83215813) and next prime (83215823).

It can be written as a sum of positive squares in only one way, i.e., 44315649 + 38900169 = 6657^2 + 6237^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (83215813) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 46293 + ... + 48056.

Almost surely, 2^83215818 is an apocalyptic number.

83215818 is an abundant number, since it is smaller than the sum of its proper divisors (126524232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

83215818 is a wasteful number, since it uses less digits than its factorization.

83215818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94371 (or 94361 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 83215818 is about 9122.2704410689. The cubic root of 83215818 is about 436.5848175813.

The spelling of 83215818 in words is "eighty-three million, two hundred fifteen thousand, eight hundred eighteen".