28193856 has 28 divisors (see below), whose sum is σ = 74596752. Its totient is φ = 9397888.

The previous prime is 28193833. The next prime is 28193857. The reversal of 28193856 is 65839182.

It is a super-3 number, since 3×28193856³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (28193857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73230 + ... + 73613.

Almost surely, 2^28193856 is an apocalyptic number.

It is an amenable number.

28193856 is an abundant number, since it is smaller than the sum of its proper divisors (46402896).

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

28193856 is a wasteful number, since it uses less digits than its factorization.

28193856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146858 (or 146848 counting only the distinct ones).

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

The square root of 28193856 is about 5309.7886963607. The cubic root of 28193856 is about 304.3580729919.

The spelling of 28193856 in words is "twenty-eight million, one hundred ninety-three thousand, eight hundred fifty-six".