28502158 has 4 divisors (see below), whose sum is σ = 42753240. Its totient is φ = 14251078.

The previous prime is 28502153. The next prime is 28502171. The reversal of 28502158 is 85120582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85120582 = 2 ⋅42560291.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28502153) by changing a digit.

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, 7125538 + ... + 7125541.

It is an arithmetic number, because the mean of its divisors is an integer number (10688310).

Almost surely, 2^28502158 is an apocalyptic number.

28502158 is a deficient number, since it is larger than the sum of its proper divisors (14251082).

28502158 is a wasteful number, since it uses less digits than its factorization.

28502158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14251081.

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 28502158 is about 5338.7412374079. The cubic root of 28502158 is about 305.4634466513.

The spelling of 28502158 in words is "twenty-eight million, five hundred two thousand, one hundred fifty-eight".