83618728218 has 20 divisors (see below), whose sum is σ = 187367891370. Its totient is φ = 27872909352.

The previous prime is 83618728213. The next prime is 83618728253. The reversal of 83618728218 is 81282781638.

83618728218 is a `hidden beast` number, since 8 + 3 + 618 + 7 + 2 + 8 + 2 + 18 = 666.

It can be written as a sum of positive squares in only one way, i.e., 80919198369 + 2699529849 = 284463^2 + 51957^2 .

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (83618728211) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 258082333 + ... + 258082656.

Almost surely, 2^83618728218 is an apocalyptic number.

83618728218 is an abundant number, since it is smaller than the sum of its proper divisors (103749163152).

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

83618728218 is a wasteful number, since it uses less digits than its factorization.

83618728218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516165003 (or 516164994 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 54.

The spelling of 83618728218 in words is "eighty-three billion, six hundred eighteen million, seven hundred twenty-eight thousand, two hundred eighteen".