28447328 has 48 divisors (see below), whose sum is σ = 68937120. Its totient is φ = 11252736.

The previous prime is 28447327. The next prime is 28447333. The reversal of 28447328 is 82374482.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28447291 and 28447300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28447327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1973 + ... + 7796.

It is an arithmetic number, because the mean of its divisors is an integer number (1436190).

Almost surely, 2^28447328 is an apocalyptic number.

28447328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28447328 is an abundant number, since it is smaller than the sum of its proper divisors (40489792).

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

28447328 is a wasteful number, since it uses less digits than its factorization.

28447328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9799 (or 9791 counting only the distinct ones).

The product of its digits is 86016, while the sum is 38.

The square root of 28447328 is about 5333.6036598158. The cubic root of 28447328 is about 305.2674461462.

The spelling of 28447328 in words is "twenty-eight million, four hundred forty-seven thousand, three hundred twenty-eight".