28113558 has 32 divisors (see below), whose sum is σ = 62353152. Its totient is φ = 8378400.

The previous prime is 28113539. The next prime is 28113571. The reversal of 28113558 is 85531182.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 535 + ... + 7517.

It is an arithmetic number, because the mean of its divisors is an integer number (1948536).

Almost surely, 2^28113558 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28113558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31176576).

28113558 is an abundant number, since it is smaller than the sum of its proper divisors (34239594).

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

28113558 is a wasteful number, since it uses less digits than its factorization.

28113558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7060.

The product of its digits is 9600, while the sum is 33.

The square root of 28113558 is about 5302.2219870541. The cubic root of 28113558 is about 304.0688541522.

The spelling of 28113558 in words is "twenty-eight million, one hundred thirteen thousand, five hundred fifty-eight".