28100807 has 4 divisors (see below), whose sum is σ = 32115216. Its totient is φ = 24086400.

The previous prime is 28100789. The next prime is 28100833. The reversal of 28100807 is 70800182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70800182 = 2 ⋅35400091.

It is a cyclic number.

It is not a de Polignac number, because 28100807 - 2⁸ = 28100551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28100837) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2007194 + ... + 2007207.

It is an arithmetic number, because the mean of its divisors is an integer number (8028804).

Almost surely, 2^28100807 is an apocalyptic number.

28100807 is a deficient number, since it is larger than the sum of its proper divisors (4014409).

28100807 is an equidigital number, since it uses as much as digits as its factorization.

28100807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4014408.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 28100807 is about 5301.0194302606. The cubic root of 28100807 is about 304.0228767122.

Adding to 28100807 its reverse (70800182), we get a palindrome (98900989).

The spelling of 28100807 in words is "twenty-eight million, one hundred thousand, eight hundred seven".