26988905 has 4 divisors (see below), whose sum is σ = 32386692. Its totient is φ = 21591120.

The previous prime is 26988893. The next prime is 26988919. The reversal of 26988905 is 50988962.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50988962 = 2 ⋅25494481.

It can be written as a sum of positive squares in 2 ways, for example, as 8832784 + 18156121 = 2972^2 + 4261^2 .

It is not a de Polignac number, because 26988905 - 2¹² = 26984809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 26988905.

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, 2698886 + ... + 2698895.

It is an arithmetic number, because the mean of its divisors is an integer number (8096673).

Almost surely, 2^26988905 is an apocalyptic number.

It is an amenable number.

26988905 is a deficient number, since it is larger than the sum of its proper divisors (5397787).

26988905 is an equidigital number, since it uses as much as digits as its factorization.

26988905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5397786.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 26988905 is about 5195.0846961335. The cubic root of 26988905 is about 299.9589017775.

The spelling of 26988905 in words is "twenty-six million, nine hundred eighty-eight thousand, nine hundred five".