215112660 has 144 divisors (see below), whose sum is σ = 707285376. Its totient is φ = 47851776.

The previous prime is 215112613. The next prime is 215112683. The reversal of 215112660 is 66211512.

It is a self number, because there is not a number n which added to its sum of digits gives 215112660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 776442 + ... + 776718.

It is an arithmetic number, because the mean of its divisors is an integer number (4911704).

Almost surely, 2^215112660 is an apocalyptic number.

215112660 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 215112660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (353642688).

215112660 is an abundant number, since it is smaller than the sum of its proper divisors (492172716).

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

215112660 is a wasteful number, since it uses less digits than its factorization.

215112660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 215112660 is about 14666.7194696019. The cubic root of 215112660 is about 599.1772612394.

The spelling of 215112660 in words is "two hundred fifteen million, one hundred twelve thousand, six hundred sixty".