28198755 has 96 divisors (see below), whose sum is σ = 57657600. Its totient is φ = 12628224.

The previous prime is 28198739. The next prime is 28198763. The reversal of 28198755 is 55789182.

It is a happy number.

It is not a de Polignac number, because 28198755 - 2⁴ = 28198739 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28198755.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 477916 + ... + 477974.

It is an arithmetic number, because the mean of its divisors is an integer number (600600).

Almost surely, 2^28198755 is an apocalyptic number.

28198755 is an abundant number, since it is smaller than the sum of its proper divisors (29458845).

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

28198755 is a wasteful number, since it uses less digits than its factorization.

28198755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 142 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 28198755 is about 5310.2499941152. The cubic root of 28198755 is about 304.3757005186.

The spelling of 28198755 in words is "twenty-eight million, one hundred ninety-eight thousand, seven hundred fifty-five".