28205773 has 4 divisors (see below), whose sum is σ = 28361788. Its totient is φ = 28049760.

The previous prime is 28205767. The next prime is 28205783. The reversal of 28205773 is 37750282.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2022084 + 26183689 = 1422^2 + 5117^2 .

It is a cyclic number.

It is not a de Polignac number, because 28205773 - 2¹³ = 28197581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28205783) 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, 77736 + ... + 78097.

It is an arithmetic number, because the mean of its divisors is an integer number (7090447).

Almost surely, 2^28205773 is an apocalyptic number.

It is an amenable number.

28205773 is a deficient number, since it is larger than the sum of its proper divisors (156015).

28205773 is a wasteful number, since it uses less digits than its factorization.

28205773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156014.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 28205773 is about 5310.9107505210. The cubic root of 28205773 is about 304.4009490503.

The spelling of 28205773 in words is "twenty-eight million, two hundred five thousand, seven hundred seventy-three".