28639158 has 16 divisors (see below), whose sum is σ = 57340656. Its totient is φ = 9536000.

The previous prime is 28639157. The next prime is 28639207. The reversal of 28639158 is 85193682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28639151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5158 + ... + 9158.

It is an arithmetic number, because the mean of its divisors is an integer number (3583791).

Almost surely, 2^28639158 is an apocalyptic number.

28639158 is an abundant number, since it is smaller than the sum of its proper divisors (28701498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28639158 is a wasteful number, since it uses less digits than its factorization.

28639158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5199.

The product of its digits is 103680, while the sum is 42.

The square root of 28639158 is about 5351.5565959821. The cubic root of 28639158 is about 305.9520835733.

It can be divided in two parts, 2863 and 9158, that added together give a palindrome (12021).

The spelling of 28639158 in words is "twenty-eight million, six hundred thirty-nine thousand, one hundred fifty-eight".