216764992 has 28 divisors (see below), whose sum is σ = 430613820. Its totient is φ = 108263936.

The previous prime is 216764971. The next prime is 216764993. The reversal of 216764992 is 299467612.

It can be written as a sum of positive squares in 2 ways, for example, as 17842176 + 198922816 = 4224^2 + 14104^2 .

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (216764993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103734 + ... + 105802.

It is an arithmetic number, because the mean of its divisors is an integer number (15379065).

Almost surely, 2^216764992 is an apocalyptic number.

It is an amenable number.

216764992 is a deficient number, since it is larger than the sum of its proper divisors (213848828).

216764992 is a wasteful number, since it uses less digits than its factorization.

216764992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3718 (or 3708 counting only the distinct ones).

The product of its digits is 326592, while the sum is 46.

The square root of 216764992 is about 14722.9410105454. The cubic root of 216764992 is about 600.7074913580.

The spelling of 216764992 in words is "two hundred sixteen million, seven hundred sixty-four thousand, nine hundred ninety-two".