26778863 has 4 divisors (see below), whose sum is σ = 27432048. Its totient is φ = 26125680.

The previous prime is 26778827. The next prime is 26778881. The reversal of 26778863 is 36887762.

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 26778863 - 2⁸ = 26778607 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 (26778883) 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, 326531 + ... + 326612.

It is an arithmetic number, because the mean of its divisors is an integer number (6858012).

Almost surely, 2^26778863 is an apocalyptic number.

26778863 is a deficient number, since it is larger than the sum of its proper divisors (653185).

26778863 is an equidigital number, since it uses as much as digits as its factorization.

26778863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653184.

The product of its digits is 677376, while the sum is 47.

The square root of 26778863 is about 5174.8297556538. The cubic root of 26778863 is about 299.1787278325.

The spelling of 26778863 in words is "twenty-six million, seven hundred seventy-eight thousand, eight hundred sixty-three".