26380781 has 8 divisors (see below), whose sum is σ = 30600000. Its totient is φ = 22274208.

The previous prime is 26380777. The next prime is 26380789. The reversal of 26380781 is 18708362.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26380781 - 2² = 26380777 is a prime.

It is a super-2 number, since 2×26380781² = 1391891212339922, 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 (26380789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27656 + ... + 28593.

It is an arithmetic number, because the mean of its divisors is an integer number (3825000).

Almost surely, 2^26380781 is an apocalyptic number.

It is an amenable number.

26380781 is a deficient number, since it is larger than the sum of its proper divisors (4219219).

26380781 is an equidigital number, since it uses as much as digits as its factorization.

26380781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56323.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 26380781 is about 5136.2224445598. Note that the first 3 decimals coincide. The cubic root of 26380781 is about 297.6888371055.

The spelling of 26380781 in words is "twenty-six million, three hundred eighty thousand, seven hundred eighty-one".