26378781 has 32 divisors (see below), whose sum is σ = 43763328. Its totient is φ = 13885440.

The previous prime is 26378773. The next prime is 26378791. The reversal of 26378781 is 18787362.

It is not a de Polignac number, because 26378781 - 2³ = 26378773 is a prime.

It is a super-2 number, since 2×26378781² = 1391680174091922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26378711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5485 + ... + 9101.

It is an arithmetic number, because the mean of its divisors is an integer number (1367604).

Almost surely, 2^26378781 is an apocalyptic number.

It is an amenable number.

26378781 is a deficient number, since it is larger than the sum of its proper divisors (17384547).

26378781 is a wasteful number, since it uses less digits than its factorization.

26378781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661.

The product of its digits is 112896, while the sum is 42.

The square root of 26378781 is about 5136.0277452522. The cubic root of 26378781 is about 297.6813140439.

The spelling of 26378781 in words is "twenty-six million, three hundred seventy-eight thousand, seven hundred eighty-one".