28928420 has 24 divisors (see below), whose sum is σ = 61355448. Its totient is φ = 11456000.

The previous prime is 28928371. The next prime is 28928423. The reversal of 28928420 is 2482982.

It can be written as a sum of positive squares in 4 ways, for example, as 2137444 + 26790976 = 1462^2 + 5176^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28928423) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5141 + ... + 9180.

It is an arithmetic number, because the mean of its divisors is an integer number (2556477).

Almost surely, 2^28928420 is an apocalyptic number.

28928420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28928420 is an abundant number, since it is smaller than the sum of its proper divisors (32427028).

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

28928420 is a wasteful number, since it uses less digits than its factorization.

28928420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14431 (or 14429 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 28928420 is about 5378.5146648494. The cubic root of 28928420 is about 306.9786967927.

The spelling of 28928420 in words is "twenty-eight million, nine hundred twenty-eight thousand, four hundred twenty".