215507660 has 48 divisors (see below), whose sum is σ = 469846272. Its totient is φ = 82944000.

The previous prime is 215507641. The next prime is 215507681. The reversal of 215507660 is 66705512.

It is a happy number.

215507660 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118760 + ... + 120560.

It is an arithmetic number, because the mean of its divisors is an integer number (9788464).

Almost surely, 2^215507660 is an apocalyptic number.

215507660 is a gapful number since it is divisible by the number (20) 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 215507660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234923136).

215507660 is an abundant number, since it is smaller than the sum of its proper divisors (254338612).

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

215507660 is a wasteful number, since it uses less digits than its factorization.

215507660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2034 (or 2032 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 215507660 is about 14680.1791542202. The cubic root of 215507660 is about 599.5437828274.

The spelling of 215507660 in words is "two hundred fifteen million, five hundred seven thousand, six hundred sixty".