28081600 has 42 divisors (see below), whose sum is σ = 69102224. Its totient is φ = 11232000.

The previous prime is 28081591. The next prime is 28081609. The reversal of 28081600 is 618082.

It is an interprime number because it is at equal distance from previous prime (28081591) and next prime (28081609).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7176 + ... + 10375.

Almost surely, 2^28081600 is an apocalyptic number.

28081600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28081600 is an abundant number, since it is smaller than the sum of its proper divisors (41020624).

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

28081600 is a wasteful number, since it uses less digits than its factorization.

28081600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17573 (or 17558 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 28081600 is about 5299.2074879174. The cubic root of 28081600 is about 303.9535940245.

Adding to 28081600 its reverse (618082), we get a palindrome (28699682).

The spelling of 28081600 in words is "twenty-eight million, eighty-one thousand, six hundred".