28120000 has 140 divisors (see below), whose sum is σ = 75382120. Its totient is φ = 10368000.

The previous prime is 28119997. The next prime is 28120013. The reversal of 28120000 is 2182.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 759982 + ... + 760018.

Almost surely, 2^28120000 is an apocalyptic number.

28120000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37691060).

28120000 is an abundant number, since it is smaller than the sum of its proper divisors (47262120).

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

28120000 is an equidigital number, since it uses as much as digits as its factorization.

28120000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 28120000 is about 5302.8294334251. The cubic root of 28120000 is about 304.0920773714.

Adding to 28120000 its reverse (2182), we get a palindrome (28122182).

The spelling of 28120000 in words is "twenty-eight million, one hundred twenty thousand".