28104578 has 4 divisors (see below), whose sum is σ = 42156870. Its totient is φ = 14052288.

The previous prime is 28104541. The next prime is 28104581. The reversal of 28104578 is 87540182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21224449 + 6880129 = 4607^2 + 2623^2 .

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 as a sum of consecutive naturals, namely, 7026143 + ... + 7026146.

Almost surely, 2^28104578 is an apocalyptic number.

28104578 is a deficient number, since it is larger than the sum of its proper divisors (14052292).

28104578 is a wasteful number, since it uses less digits than its factorization.

28104578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14052291.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 28104578 is about 5301.3751046309. The cubic root of 28104578 is about 304.0364755979.

It can be divided in two parts, 28104 and 578, that added together give a palindrome (28682).

The spelling of 28104578 in words is "twenty-eight million, one hundred four thousand, five hundred seventy-eight".