216587682636 has 96 divisors (see below), whose sum is σ = 557166559488. Its totient is φ = 65061722880.

The previous prime is 216587682631. The next prime is 216587682643. The reversal of 216587682636 is 636286785612.

It is a super-3 number, since 3×216587682636³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216587682636.

It is not an unprimeable number, because it can be changed into a prime (216587682631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16971570 + ... + 16984326.

It is an arithmetic number, because the mean of its divisors is an integer number (5803818328).

Almost surely, 2^216587682636 is an apocalyptic number.

216587682636 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216587682636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278583279744).

216587682636 is an abundant number, since it is smaller than the sum of its proper divisors (340578876852).

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

216587682636 is a wasteful number, since it uses less digits than its factorization.

216587682636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15351 (or 15349 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 60.

The spelling of 216587682636 in words is "two hundred sixteen billion, five hundred eighty-seven million, six hundred eighty-two thousand, six hundred thirty-six".