28040128 has 56 divisors (see below), whose sum is σ = 59545728. Its totient is φ = 13069056.

The previous prime is 28040113. The next prime is 28040189. The reversal of 28040128 is 82104082.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63075 + ... + 63517.

Almost surely, 2^28040128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28040128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29772864).

28040128 is an abundant number, since it is smaller than the sum of its proper divisors (31505600).

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

28040128 is a wasteful number, since it uses less digits than its factorization.

28040128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521 (or 511 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 28040128 is about 5295.2930041689. The cubic root of 28040128 is about 303.8038901376.

The spelling of 28040128 in words is "twenty-eight million, forty thousand, one hundred twenty-eight".