215506668 has 48 divisors (see below), whose sum is σ = 559010816. Its totient is φ = 64169280.

The previous prime is 215506663. The next prime is 215506673. The reversal of 215506668 is 866605512.

It is an interprime number because it is at equal distance from previous prime (215506663) and next prime (215506673).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (215506661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17446 + ... + 27117.

Almost surely, 2^215506668 is an apocalyptic number.

It is an amenable number.

215506668 is an abundant number, since it is smaller than the sum of its proper divisors (343504148).

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

215506668 is a wasteful number, since it uses less digits than its factorization.

215506668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44614 (or 44612 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 215506668 is about 14680.1453671277. The cubic root of 215506668 is about 599.5428629090.

The spelling of 215506668 in words is "two hundred fifteen million, five hundred six thousand, six hundred sixty-eight".