28040928 has 24 divisors (see below), whose sum is σ = 73607688. Its totient is φ = 9346944.

The previous prime is 28040927. The next prime is 28040951. The reversal of 28040928 is 82904082.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28040927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145951 + ... + 146142.

It is an arithmetic number, because the mean of its divisors is an integer number (3066987).

Almost surely, 2^28040928 is an apocalyptic number.

It is an amenable number.

28040928 is an abundant number, since it is smaller than the sum of its proper divisors (45566760).

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

28040928 is a wasteful number, since it uses less digits than its factorization.

28040928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292106 (or 292098 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 28040928 is about 5295.3685424152. The cubic root of 28040928 is about 303.8067793398.

The spelling of 28040928 in words is "twenty-eight million, forty thousand, nine hundred twenty-eight".