28407928 has 16 divisors (see below), whose sum is σ = 54398880. Its totient is φ = 13901568.

The previous prime is 28407919. The next prime is 28407937. The reversal of 28407928 is 82970482.

It is an interprime number because it is at equal distance from previous prime (28407919) and next prime (28407937).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37401 + ... + 38152.

It is an arithmetic number, because the mean of its divisors is an integer number (3399930).

Almost surely, 2^28407928 is an apocalyptic number.

It is an amenable number.

28407928 is a deficient number, since it is larger than the sum of its proper divisors (25990952).

28407928 is a wasteful number, since it uses less digits than its factorization.

28407928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75606 (or 75602 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 28407928 is about 5329.9088172313. The cubic root of 28407928 is about 305.1264476146.

The spelling of 28407928 in words is "twenty-eight million, four hundred seven thousand, nine hundred twenty-eight".