216964782 has 24 divisors (see below), whose sum is σ = 476714160. Its totient is φ = 71302560.

The previous prime is 216964763. The next prime is 216964789. The reversal of 216964782 is 287469612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216964789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83607 + ... + 86162.

It is an arithmetic number, because the mean of its divisors is an integer number (19863090).

Almost surely, 2^216964782 is an apocalyptic number.

216964782 is an abundant number, since it is smaller than the sum of its proper divisors (259749378).

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

216964782 is a wasteful number, since it uses less digits than its factorization.

216964782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169848 (or 169845 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 216964782 is about 14729.7244373410. The cubic root of 216964782 is about 600.8919899328.

It can be divided in two parts, 2169647 and 82, that added together give a square (2169729 = 1473²).

The spelling of 216964782 in words is "two hundred sixteen million, nine hundred sixty-four thousand, seven hundred eighty-two".