215934660 has 144 divisors (see below), whose sum is σ = 686003136. Its totient is φ = 57013632.

The previous prime is 215934647. The next prime is 215934661. The reversal of 215934660 is 66439512.

It is a happy number.

215934660 is a `hidden beast` number, since 2 + 1 + 593 + 4 + 6 + 60 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (215934661) 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, 762879 + ... + 763161.

Almost surely, 2^215934660 is an apocalyptic number.

215934660 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 215934660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (343001568).

215934660 is an abundant number, since it is smaller than the sum of its proper divisors (470068476).

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

215934660 is a wasteful number, since it uses less digits than its factorization.

215934660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 215934660 is about 14694.7153766243. The cubic root of 215934660 is about 599.9394938986.

The spelling of 215934660 in words is "two hundred fifteen million, nine hundred thirty-four thousand, six hundred sixty".