28158273 has 90 divisors (see below), whose sum is σ = 53010342. Its totient is φ = 14826240.

The previous prime is 28158269. The next prime is 28158287. The reversal of 28158273 is 37285182.

28158273 is a `hidden beast` number, since 2 + 8 + 1 + 582 + 73 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 627264 + 27531009 = 792^2 + 5247^2 .

It is not a de Polignac number, because 28158273 - 2² = 28158269 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28158173) by changing a digit.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 1656361 + ... + 1656377.

Almost surely, 2^28158273 is an apocalyptic number.

It is an amenable number.

28158273 is a deficient number, since it is larger than the sum of its proper divisors (24852069).

28158273 is a wasteful number, since it uses less digits than its factorization.

28158273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 44 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 28158273 is about 5306.4369401699. The cubic root of 28158273 is about 304.2299773219.

The spelling of 28158273 in words is "twenty-eight million, one hundred fifty-eight thousand, two hundred seventy-three".