28055805 has 16 divisors (see below), whose sum is σ = 46103424. Its totient is φ = 14558400.

The previous prime is 28055801. The next prime is 28055813. The reversal of 28055805 is 50855082.

It is not a de Polignac number, because 28055805 - 2² = 28055801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28055801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24721 + ... + 25830.

It is an arithmetic number, because the mean of its divisors is an integer number (2881464).

Almost surely, 2^28055805 is an apocalyptic number.

It is an amenable number.

28055805 is a deficient number, since it is larger than the sum of its proper divisors (18047619).

28055805 is a wasteful number, since it uses less digits than its factorization.

28055805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50596.

The product of its (nonzero) digits is 16000, while the sum is 33.

The square root of 28055805 is about 5296.7730742406. The cubic root of 28055805 is about 303.8604976569.

The spelling of 28055805 in words is "twenty-eight million, fifty-five thousand, eight hundred five".