216783297 has 10 divisors (see below), whose sum is σ = 323836898. Its totient is φ = 144522144.

The previous prime is 216783289. The next prime is 216783313. The reversal of 216783297 is 792387612.

It can be written as a sum of positive squares in only one way, i.e., 203233536 + 13549761 = 14256^2 + 3681^2 .

It is not a de Polignac number, because 216783297 - 2³ = 216783289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216783097) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1338088 + ... + 1338249.

Almost surely, 2^216783297 is an apocalyptic number.

216783297 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

216783297 is a deficient number, since it is larger than the sum of its proper divisors (107053601).

216783297 is an equidigital number, since it uses as much as digits as its factorization.

216783297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2676349 (or 2676340 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 216783297 is about 14723.5626463163. The cubic root of 216783297 is about 600.7244000556.

It can be divided in two parts, 21678329 and 7, that added together give a square (21678336 = 4656²).

The spelling of 216783297 in words is "two hundred sixteen million, seven hundred eighty-three thousand, two hundred ninety-seven".