28013773 has 8 divisors (see below), whose sum is σ = 30463992. Its totient is φ = 25652736.

The previous prime is 28013767. The next prime is 28013803. The reversal of 28013773 is 37731082.

It can be written as a sum of positive squares in 4 ways, for example, as 23164969 + 4848804 = 4813^2 + 2202^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28013773 - 2⁹ = 28013261 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 (28013723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21640 + ... + 22897.

It is an arithmetic number, because the mean of its divisors is an integer number (3807999).

Almost surely, 2^28013773 is an apocalyptic number.

It is an amenable number.

28013773 is a deficient number, since it is larger than the sum of its proper divisors (2450219).

28013773 is a wasteful number, since it uses less digits than its factorization.

28013773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44591.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 28013773 is about 5292.8038882997. The cubic root of 28013773 is about 303.7086782403.

The spelling of 28013773 in words is "twenty-eight million, thirteen thousand, seven hundred seventy-three".