28138773 has 16 divisors (see below), whose sum is σ = 40920320. Its totient is φ = 17095104.

The previous prime is 28138771. The next prime is 28138777. The reversal of 28138773 is 37783182.

It is not a de Polignac number, because 28138773 - 2¹ = 28138771 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28138771) 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, 1486 + ... + 7647.

It is an arithmetic number, because the mean of its divisors is an integer number (2557520).

Almost surely, 2^28138773 is an apocalyptic number.

It is an amenable number.

28138773 is a deficient number, since it is larger than the sum of its proper divisors (12781547).

28138773 is a wasteful number, since it uses less digits than its factorization.

28138773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9228.

The product of its digits is 56448, while the sum is 39.

The square root of 28138773 is about 5304.5992308562. The cubic root of 28138773 is about 304.1597332587.

The spelling of 28138773 in words is "twenty-eight million, one hundred thirty-eight thousand, seven hundred seventy-three".