28523145 has 48 divisors (see below), whose sum is σ = 53647488. Its totient is φ = 12902400.

The previous prime is 28523119. The next prime is 28523177. The reversal of 28523145 is 54132582.

It is not a de Polignac number, because 28523145 - 2⁶ = 28523081 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 110857 + ... + 111113.

It is an arithmetic number, because the mean of its divisors is an integer number (1117656).

Almost surely, 2^28523145 is an apocalyptic number.

It is an amenable number.

28523145 is a deficient number, since it is larger than the sum of its proper divisors (25124343).

28523145 is a wasteful number, since it uses less digits than its factorization.

28523145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430 (or 423 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 28523145 is about 5340.7064139494. The cubic root of 28523145 is about 305.5384022449.

The spelling of 28523145 in words is "twenty-eight million, five hundred twenty-three thousand, one hundred forty-five".