26463681 has 6 divisors (see below), whose sum is σ = 38225330. Its totient is φ = 17642448.

The previous prime is 26463673. The next prime is 26463709. The reversal of 26463681 is 18636462.

26463681 is a `hidden beast` number, since 2 + 646 + 3 + 6 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 22240656 + 4223025 = 4716^2 + 2055^2 .

It is not a de Polignac number, because 26463681 - 2³ = 26463673 is a prime.

It is a super-2 number, since 2×26463681² = 1400652824139522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26463881) 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 5 ways as a sum of consecutive naturals, for example, 1470196 + ... + 1470213.

Almost surely, 2^26463681 is an apocalyptic number.

It is an amenable number.

26463681 is a deficient number, since it is larger than the sum of its proper divisors (11761649).

26463681 is a wasteful number, since it uses less digits than its factorization.

26463681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2940415 (or 2940412 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 26463681 is about 5144.2862478676. The cubic root of 26463681 is about 298.0003340687. Note that the first 3 decimals are identical.

The spelling of 26463681 in words is "twenty-six million, four hundred sixty-three thousand, six hundred eighty-one".