28541578 has 16 divisors (see below), whose sum is σ = 47353320. Its totient is φ = 12816576.

The previous prime is 28541573. The next prime is 28541581. The reversal of 28541578 is 87514582.

It can be written as a sum of positive squares in 4 ways, for example, as 17164449 + 11377129 = 4143^2 + 3373^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28541578.

It is not an unprimeable number, because it can be changed into a prime (28541573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13873 + ... + 15796.

Almost surely, 2^28541578 is an apocalyptic number.

28541578 is a deficient number, since it is larger than the sum of its proper divisors (18811742).

28541578 is a wasteful number, since it uses less digits than its factorization.

28541578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29721.

The product of its digits is 89600, while the sum is 40.

The square root of 28541578 is about 5342.4318432714. The cubic root of 28541578 is about 305.6042058415.

The spelling of 28541578 in words is "twenty-eight million, five hundred forty-one thousand, five hundred seventy-eight".