216868494 has 16 divisors (see below), whose sum is σ = 435283920. Its totient is φ = 72031680.

The previous prime is 216868493. The next prime is 216868499. The reversal of 216868494 is 494868612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216868493) 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, 62629 + ... + 66000.

It is an arithmetic number, because the mean of its divisors is an integer number (27205245).

Almost surely, 2^216868494 is an apocalyptic number.

216868494 is an abundant number, since it is smaller than the sum of its proper divisors (218415426).

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

216868494 is a wasteful number, since it uses less digits than its factorization.

216868494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128915.

The product of its digits is 663552, while the sum is 48.

The square root of 216868494 is about 14726.4555817074. The cubic root of 216868494 is about 600.8030857204.

The spelling of 216868494 in words is "two hundred sixteen million, eight hundred sixty-eight thousand, four hundred ninety-four".