26821864 has 16 divisors (see below), whose sum is σ = 52477920. Its totient is φ = 12827760.

The previous prime is 26821853. The next prime is 26821867. The reversal of 26821864 is 46812862.

It is not an unprimeable number, because it can be changed into a prime (26821867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72702 + ... + 73069.

It is an arithmetic number, because the mean of its divisors is an integer number (3279870).

Almost surely, 2^26821864 is an apocalyptic number.

It is an amenable number.

26821864 is a deficient number, since it is larger than the sum of its proper divisors (25656056).

26821864 is a wasteful number, since it uses less digits than its factorization.

26821864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145800 (or 145796 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 26821864 is about 5178.9829117308. The cubic root of 26821864 is about 299.3387807380.

The spelling of 26821864 in words is "twenty-six million, eight hundred twenty-one thousand, eight hundred sixty-four".