215170668 has 144 divisors (see below), whose sum is σ = 606627840. Its totient is φ = 66484800.

The previous prime is 215170663. The next prime is 215170741. The reversal of 215170668 is 866071512.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215170663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1126453 + ... + 1126643.

Almost surely, 2^215170668 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 215170668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303313920).

215170668 is an abundant number, since it is smaller than the sum of its proper divisors (391457172).

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

215170668 is a wasteful number, since it uses less digits than its factorization.

215170668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 215170668 is about 14668.6968746375. The cubic root of 215170668 is about 599.2311151143.

The spelling of 215170668 in words is "two hundred fifteen million, one hundred seventy thousand, six hundred sixty-eight".