216268387 has 8 divisors (see below), whose sum is σ = 218852816. Its totient is φ = 213691392.

The previous prime is 216268361. The next prime is 216268411. The reversal of 216268387 is 783862612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216268387 - 2¹¹ = 216266339 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (216268357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74923 + ... + 77755.

It is an arithmetic number, because the mean of its divisors is an integer number (27356602).

Almost surely, 2^216268387 is an apocalyptic number.

216268387 is a deficient number, since it is larger than the sum of its proper divisors (2584429).

216268387 is an equidigital number, since it uses as much as digits as its factorization.

216268387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3717.

The product of its digits is 193536, while the sum is 43.

The square root of 216268387 is about 14706.0663333197. The cubic root of 216268387 is about 600.2484036267.

The spelling of 216268387 in words is "two hundred sixteen million, two hundred sixty-eight thousand, three hundred eighty-seven".