28198956 has 12 divisors (see below), whose sum is σ = 65797592. Its totient is φ = 9399648.

The previous prime is 28198949. The next prime is 28198987. The reversal of 28198956 is 65989182.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28198956² = 1590362238979872, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1174945 + ... + 1174968.

Almost surely, 2^28198956 is an apocalyptic number.

It is an amenable number.

28198956 is an abundant number, since it is smaller than the sum of its proper divisors (37598636).

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

28198956 is a wasteful number, since it uses less digits than its factorization.

28198956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2349920 (or 2349918 counting only the distinct ones).

The product of its digits is 311040, while the sum is 48.

The square root of 28198956 is about 5310.2689197441. The cubic root of 28198956 is about 304.3764237109.

The spelling of 28198956 in words is "twenty-eight million, one hundred ninety-eight thousand, nine hundred fifty-six".