7778223 has 12 divisors (see below), whose sum is σ = 11390080. Its totient is φ = 5114016.

The previous prime is 7778213. The next prime is 7778237. The reversal of 7778223 is 3228777.

It is not a de Polignac number, because 7778223 - 2⁶ = 7778159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7778203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5263 + ... + 6576.

Almost surely, 2^7778223 is an apocalyptic number.

7778223 is a gapful number since it is divisible by the number (73) formed by its first and last digit.

7778223 is a deficient number, since it is larger than the sum of its proper divisors (3611857).

7778223 is a wasteful number, since it uses less digits than its factorization.

7778223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11918 (or 11915 counting only the distinct ones).

The product of its digits is 32928, while the sum is 36.

The square root of 7778223 is about 2788.9465753219. The cubic root of 7778223 is about 198.1345122097.

It can be divided in two parts, 7778 and 223, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 7778223 in words is "seven million, seven hundred seventy-eight thousand, two hundred twenty-three".