28127500 has 30 divisors (see below), whose sum is σ = 61514684. Its totient is φ = 11250000.

The previous prime is 28127497. The next prime is 28127501. The reversal of 28127500 is 572182.

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

It is not an unprimeable number, because it can be changed into a prime (28127501) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 3126 + ... + 8125.

Almost surely, 2^28127500 is an apocalyptic number.

28127500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28127500 is an abundant number, since it is smaller than the sum of its proper divisors (33387184).

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

28127500 is a wasteful number, since it uses less digits than its factorization.

28127500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11275 (or 11258 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 28127500 is about 5303.5365559219. The cubic root of 28127500 is about 304.1191101813.

Adding to 28127500 its reverse (572182), we get a palindrome (28699682).

The spelling of 28127500 in words is "twenty-eight million, one hundred twenty-seven thousand, five hundred".