28040028 has 24 divisors (see below), whose sum is σ = 65573760. Its totient is φ = 9325680.

The previous prime is 28040017. The next prime is 28040041. The reversal of 28040028 is 82004082.

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, 3513 + ... + 8271.

It is an arithmetic number, because the mean of its divisors is an integer number (2732240).

Almost surely, 2^28040028 is an apocalyptic number.

It is an amenable number.

28040028 is an abundant number, since it is smaller than the sum of its proper divisors (37533732).

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

28040028 is a wasteful number, since it uses less digits than its factorization.

28040028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5257 (or 5255 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 28040028 is about 5295.2835618123. The cubic root of 28040028 is about 303.8035289834.

The spelling of 28040028 in words is "twenty-eight million, forty thousand, twenty-eight".