28105851 has 4 divisors (see below), whose sum is σ = 37474472. Its totient is φ = 18737232.

The previous prime is 28105837. The next prime is 28105853. The reversal of 28105851 is 15850182.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28105851 - 2⁷ = 28105723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28105853) 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, 4684306 + ... + 4684311.

It is an arithmetic number, because the mean of its divisors is an integer number (9368618).

Almost surely, 2^28105851 is an apocalyptic number.

28105851 is a deficient number, since it is larger than the sum of its proper divisors (9368621).

28105851 is an equidigital number, since it uses as much as digits as its factorization.

28105851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9368620.

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 28105851 is about 5301.4951664601. The cubic root of 28105851 is about 304.0410659840.

The spelling of 28105851 in words is "twenty-eight million, one hundred five thousand, eight hundred fifty-one".