28457773 has 6 divisors (see below), whose sum is σ = 29260266. Its totient is φ = 27657072.

The previous prime is 28457771. The next prime is 28457789. The reversal of 28457773 is 37775482.

It can be written as a sum of positive squares in 3 ways, for example, as 20088324 + 8369449 = 4482^2 + 2893^2 .

It is not a de Polignac number, because 28457773 - 2¹ = 28457771 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28457771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32011 + ... + 32887.

It is an arithmetic number, because the mean of its divisors is an integer number (4876711).

Almost surely, 2^28457773 is an apocalyptic number.

It is an amenable number.

28457773 is a deficient number, since it is larger than the sum of its proper divisors (802493).

28457773 is an frugal number, since it uses more digits than its factorization.

28457773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791 (or 914 counting only the distinct ones).

The product of its digits is 329280, while the sum is 43.

The square root of 28457773 is about 5334.5827390715. The cubic root of 28457773 is about 305.3048032378.

The spelling of 28457773 in words is "twenty-eight million, four hundred fifty-seven thousand, seven hundred seventy-three".