26781431 has 4 divisors (see below), whose sum is σ = 28191000. Its totient is φ = 25371864.

The previous prime is 26781421. The next prime is 26781439. The reversal of 26781431 is 13418762.

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 26781431 - 2⁶ = 26781367 is a prime.

It is a super-2 number, since 2×26781431² = 1434490092815522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26781439) 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, 704756 + ... + 704793.

It is an arithmetic number, because the mean of its divisors is an integer number (7047750).

Almost surely, 2^26781431 is an apocalyptic number.

26781431 is a deficient number, since it is larger than the sum of its proper divisors (1409569).

26781431 is a wasteful number, since it uses less digits than its factorization.

26781431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409568.

The product of its digits is 8064, while the sum is 32.

The square root of 26781431 is about 5175.0778738102. The cubic root of 26781431 is about 299.1882909272.

The spelling of 26781431 in words is "twenty-six million, seven hundred eighty-one thousand, four hundred thirty-one".