28120444 has 48 divisors (see below), whose sum is σ = 57609216. Its totient is φ = 11880000.

The previous prime is 28120423. The next prime is 28120447. The reversal of 28120444 is 44402182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28120447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37069 + ... + 37819.

It is an arithmetic number, because the mean of its divisors is an integer number (1200192).

Almost surely, 2^28120444 is an apocalyptic number.

It is an amenable number.

28120444 is an abundant number, since it is smaller than the sum of its proper divisors (29488772).

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

28120444 is a wasteful number, since it uses less digits than its factorization.

28120444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826 (or 824 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 28120444 is about 5302.8712977028. The cubic root of 28120444 is about 304.0936778476.

The spelling of 28120444 in words is "twenty-eight million, one hundred twenty thousand, four hundred forty-four".