28449320 has 32 divisors (see below), whose sum is σ = 66078720. Its totient is φ = 11012160.

The previous prime is 28449307. The next prime is 28449353. The reversal of 28449320 is 2394482.

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, 10232 + ... + 12711.

It is an arithmetic number, because the mean of its divisors is an integer number (2064960).

Almost surely, 2^28449320 is an apocalyptic number.

28449320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28449320 is an abundant number, since it is smaller than the sum of its proper divisors (37629400).

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

28449320 is a wasteful number, since it uses less digits than its factorization.

28449320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22985 (or 22981 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 28449320 is about 5333.7903970816. The cubic root of 28449320 is about 305.2745713445.

The spelling of 28449320 in words is "twenty-eight million, four hundred forty-nine thousand, three hundred twenty".