215819868 has 48 divisors (see below), whose sum is σ = 551738880. Its totient is φ = 65116800.

The previous prime is 215819867. The next prime is 215819887. The reversal of 215819868 is 868918512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215819867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28128 + ... + 34968.

It is an arithmetic number, because the mean of its divisors is an integer number (11494560).

Almost surely, 2^215819868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215819868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275869440).

215819868 is an abundant number, since it is smaller than the sum of its proper divisors (335919012).

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

215819868 is a wasteful number, since it uses less digits than its factorization.

215819868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7098 (or 7096 counting only the distinct ones).

The product of its digits is 276480, while the sum is 48.

The square root of 215819868 is about 14690.8089634302. The cubic root of 215819868 is about 599.8331647254.

The spelling of 215819868 in words is "two hundred fifteen million, eight hundred nineteen thousand, eight hundred sixty-eight".