215813860 has 12 divisors (see below), whose sum is σ = 453209148. Its totient is φ = 86325536.

The previous prime is 215813839. The next prime is 215813869. The reversal of 215813860 is 68318512.

215813860 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 105185536 + 110628324 = 10256^2 + 10518^2 .

It is not an unprimeable number, because it can be changed into a prime (215813869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5395327 + ... + 5395366.

It is an arithmetic number, because the mean of its divisors is an integer number (37767429).

Almost surely, 2^215813860 is an apocalyptic number.

215813860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215813860 is an abundant number, since it is smaller than the sum of its proper divisors (237395288).

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

215813860 is a wasteful number, since it uses less digits than its factorization.

215813860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10790702 (or 10790700 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 215813860 is about 14690.6044804154. The cubic root of 215813860 is about 599.8275986158.

The spelling of 215813860 in words is "two hundred fifteen million, eight hundred thirteen thousand, eight hundred sixty".