26778223 has 4 divisors (see below), whose sum is σ = 27701640. Its totient is φ = 25854808.

The previous prime is 26778209. The next prime is 26778251. The reversal of 26778223 is 32287762.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26778223 - 2⁹ = 26777711 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 (26778253) 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, 461665 + ... + 461722.

It is an arithmetic number, because the mean of its divisors is an integer number (6925410).

Almost surely, 2^26778223 is an apocalyptic number.

26778223 is a deficient number, since it is larger than the sum of its proper divisors (923417).

26778223 is an equidigital number, since it uses as much as digits as its factorization.

26778223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923416.

The product of its digits is 56448, while the sum is 37.

The square root of 26778223 is about 5174.7679175012. The cubic root of 26778223 is about 299.1763444115.

The spelling of 26778223 in words is "twenty-six million, seven hundred seventy-eight thousand, two hundred twenty-three".