28171600 has 30 divisors (see below), whose sum is σ = 67683230. Its totient is φ = 11268480.

The previous prime is 28171597. The next prime is 28171621. The reversal of 28171600 is 617182.

It can be written as a sum of positive squares in 3 ways, for example, as 1710864 + 26460736 = 1308^2 + 5144^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34815 + ... + 35614.

Almost surely, 2^28171600 is an apocalyptic number.

28171600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28171600 is an abundant number, since it is smaller than the sum of its proper divisors (39511630).

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

28171600 is a wasteful number, since it uses less digits than its factorization.

28171600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70447 (or 70436 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 28171600 is about 5307.6925306577. The cubic root of 28171600 is about 304.2779659827.

Adding to 28171600 its reverse (617182), we get a palindrome (28788782).

The spelling of 28171600 in words is "twenty-eight million, one hundred seventy-one thousand, six hundred".