28026813 has 8 divisors (see below), whose sum is σ = 37526400. Its totient is φ = 18605888.

The previous prime is 28026787. The next prime is 28026827. The reversal of 28026813 is 31862082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28026813 - 2⁵ = 28026781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28026853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18828 + ... + 20261.

It is an arithmetic number, because the mean of its divisors is an integer number (4690800).

Almost surely, 2^28026813 is an apocalyptic number.

It is an amenable number.

28026813 is a deficient number, since it is larger than the sum of its proper divisors (9499587).

28026813 is a wasteful number, since it uses less digits than its factorization.

28026813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39331.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 28026813 is about 5294.0356062271. The cubic root of 28026813 is about 303.7557949071.

Adding to 28026813 its reverse (31862082), we get a palindrome (59888895).

The spelling of 28026813 in words is "twenty-eight million, twenty-six thousand, eight hundred thirteen".