28538793 has 12 divisors (see below), whose sum is σ = 41328820. Its totient is φ = 18976896.

The previous prime is 28538773. The next prime is 28538819. The reversal of 28538793 is 39783582.

28538793 is a `hidden beast` number, since 28 + 538 + 7 + 93 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27594009 + 944784 = 5253^2 + 972^2 .

It is not a de Polignac number, because 28538793 - 2⁵ = 28538761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28538723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 196 + ... + 7557.

Almost surely, 2^28538793 is an apocalyptic number.

It is an amenable number.

28538793 is a deficient number, since it is larger than the sum of its proper divisors (12790027).

28538793 is a wasteful number, since it uses less digits than its factorization.

28538793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8168 (or 8165 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 28538793 is about 5342.1711878224. The cubic root of 28538793 is about 305.5942655432.

The spelling of 28538793 in words is "twenty-eight million, five hundred thirty-eight thousand, seven hundred ninety-three".