216778033 has 6 divisors (see below), whose sum is σ = 230280086. Its totient is φ = 204026112.

The previous prime is 216778027. The next prime is 216778057. The reversal of 216778033 is 330877612.

It can be written as a sum of positive squares in 3 ways, for example, as 110523169 + 106254864 = 10513^2 + 10308^2 .

It is not a de Polignac number, because 216778033 - 2¹⁷ = 216646961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216777983 and 216778001.

It is not an unprimeable number, because it can be changed into a prime (216778073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 374760 + ... + 375337.

Almost surely, 2^216778033 is an apocalyptic number.

It is an amenable number.

216778033 is a deficient number, since it is larger than the sum of its proper divisors (13502053).

216778033 is an equidigital number, since it uses as much as digits as its factorization.

216778033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750131 (or 750114 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 216778033 is about 14723.3838841484. The cubic root of 216778033 is about 600.7195376902.

It can be divided in two parts, 2167 and 78033, that added together give a triangular number (80200 = T₄₀₀).

The spelling of 216778033 in words is "two hundred sixteen million, seven hundred seventy-eight thousand, thirty-three".