26821998 has 24 divisors (see below), whose sum is σ = 66416688. Its totient is φ = 7663392.

The previous prime is 26821987. The next prime is 26822017. The reversal of 26821998 is 89912862.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 106311 + ... + 106562.

It is an arithmetic number, because the mean of its divisors is an integer number (2767362).

Almost surely, 2^26821998 is an apocalyptic number.

26821998 is an abundant number, since it is smaller than the sum of its proper divisors (39594690).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26821998 is a wasteful number, since it uses less digits than its factorization.

26821998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212888 (or 212885 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 26821998 is about 5178.9958486178. The cubic root of 26821998 is about 299.3392792285.

The spelling of 26821998 in words is "twenty-six million, eight hundred twenty-one thousand, nine hundred ninety-eight".