28163800 has 48 divisors (see below), whose sum is σ = 74838960. Its totient is φ = 9655680.

The previous prime is 28163789. The next prime is 28163801. The reversal of 28163800 is 836182.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28163801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8659 + ... + 11458.

It is an arithmetic number, because the mean of its divisors is an integer number (1559145).

Almost surely, 2^28163800 is an apocalyptic number.

28163800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28163800 is an abundant number, since it is smaller than the sum of its proper divisors (46675160).

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

28163800 is a wasteful number, since it uses less digits than its factorization.

28163800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20140 (or 20131 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 28163800 is about 5306.9576972122. The cubic root of 28163800 is about 304.2498811122.

Adding to 28163800 its reverse (836182), we get a palindrome (28999982).

The spelling of 28163800 in words is "twenty-eight million, one hundred sixty-three thousand, eight hundred".