26980813 has 4 divisors (see below), whose sum is σ = 26999968. Its totient is φ = 26961660.

The previous prime is 26980801. The next prime is 26980843. The reversal of 26980813 is 31808962.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31808962 = 2 ⋅15904481.

It is a cyclic number.

It is not a de Polignac number, because 26980813 - 2⁹ = 26980301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26980843) 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, 7281 + ... + 10342.

It is an arithmetic number, because the mean of its divisors is an integer number (6749992).

Almost surely, 2^26980813 is an apocalyptic number.

It is an amenable number.

26980813 is a deficient number, since it is larger than the sum of its proper divisors (19155).

26980813 is a wasteful number, since it uses less digits than its factorization.

26980813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19154.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 26980813 is about 5194.3058246507. The cubic root of 26980813 is about 299.9289201972.

The spelling of 26980813 in words is "twenty-six million, nine hundred eighty thousand, eight hundred thirteen".