26985815 has 4 divisors (see below), whose sum is σ = 32382984. Its totient is φ = 21588648.

The previous prime is 26985809. The next prime is 26985823. The reversal of 26985815 is 51858962.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51858962 = 2 ⋅25929481.

It is a cyclic number.

It is not a de Polignac number, because 26985815 - 2⁸ = 26985559 is a prime.

It is a super-2 number, since 2×26985815² = 1456468422428450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2698577 + ... + 2698586.

It is an arithmetic number, because the mean of its divisors is an integer number (8095746).

Almost surely, 2^26985815 is an apocalyptic number.

26985815 is a deficient number, since it is larger than the sum of its proper divisors (5397169).

26985815 is an equidigital number, since it uses as much as digits as its factorization.

26985815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5397168.

The product of its digits is 172800, while the sum is 44.

The square root of 26985815 is about 5194.7872911217. The cubic root of 26985815 is about 299.9474537598.

The spelling of 26985815 in words is "twenty-six million, nine hundred eighty-five thousand, eight hundred fifteen".