26780431 has 2 divisors, whose sum is σ = 26780432. Its totient is φ = 26780430.

The previous prime is 26780407. The next prime is 26780437. The reversal of 26780431 is 13408762.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26780431 - 2⁵ = 26780399 is a prime.

It is a super-2 number, since 2×26780431² = 1434382969091522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 26780393 and 26780402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26780437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13390215 + 13390216.

It is an arithmetic number, because the mean of its divisors is an integer number (13390216).

Almost surely, 2^26780431 is an apocalyptic number.

26780431 is a deficient number, since it is larger than the sum of its proper divisors (1).

26780431 is an equidigital number, since it uses as much as digits as its factorization.

26780431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 26780431 is about 5174.9812560047. The cubic root of 26780431 is about 299.1845670534.

The spelling of 26780431 in words is "twenty-six million, seven hundred eighty thousand, four hundred thirty-one".