216992744 has 16 divisors (see below), whose sum is σ = 407189220. Its totient is φ = 108408960.

The previous prime is 216992707. The next prime is 216992747. The reversal of 216992744 is 447299612.

It can be written as a sum of positive squares in 2 ways, for example, as 191490244 + 25502500 = 13838^2 + 5050^2 .

It is a junction number, because it is equal to n+sod(n) for n = 216992695 and 216992704.

It is not an unprimeable number, because it can be changed into a prime (216992747) 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, 302 + ... + 20834.

Almost surely, 2^216992744 is an apocalyptic number.

It is an amenable number.

216992744 is a deficient number, since it is larger than the sum of its proper divisors (190196476).

216992744 is a wasteful number, since it uses less digits than its factorization.

216992744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21860 (or 21856 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 216992744 is about 14730.6735759096. The cubic root of 216992744 is about 600.9178027551.

The spelling of 216992744 in words is "two hundred sixteen million, nine hundred ninety-two thousand, seven hundred forty-four".