28407773 has 4 divisors (see below), whose sum is σ = 28418460. Its totient is φ = 28397088.

The previous prime is 28407763. The next prime is 28407839. The reversal of 28407773 is 37770482.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10876804 + 17530969 = 3298^2 + 4187^2 .

It is a cyclic number.

It is not a de Polignac number, because 28407773 - 2²⁰ = 27359197 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 (28407703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2111 + ... + 7827.

It is an arithmetic number, because the mean of its divisors is an integer number (7104615).

Almost surely, 2^28407773 is an apocalyptic number.

It is an amenable number.

28407773 is a deficient number, since it is larger than the sum of its proper divisors (10687).

28407773 is an equidigital number, since it uses as much as digits as its factorization.

28407773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10686.

The product of its (nonzero) digits is 65856, while the sum is 38.

The square root of 28407773 is about 5329.8942766250. The cubic root of 28407773 is about 305.1258926676.

The spelling of 28407773 in words is "twenty-eight million, four hundred seven thousand, seven hundred seventy-three".