28013806 has 8 divisors (see below), whose sum is σ = 42087600. Its totient is φ = 13984608.

The previous prime is 28013803. The next prime is 28013819. The reversal of 28013806 is 60831082.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28013803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9531 + ... + 12118.

It is an arithmetic number, because the mean of its divisors is an integer number (5260950).

Almost surely, 2^28013806 is an apocalyptic number.

28013806 is a deficient number, since it is larger than the sum of its proper divisors (14073794).

28013806 is a wasteful number, since it uses less digits than its factorization.

28013806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22298.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 28013806 is about 5292.8070057390. The cubic root of 28013806 is about 303.7087974957.

Adding to 28013806 its reverse (60831082), we get a palindrome (88844888).

The spelling of 28013806 in words is "twenty-eight million, thirteen thousand, eight hundred six".