28944840 has 32 divisors (see below), whose sum is σ = 86834880. Its totient is φ = 7718592.

The previous prime is 28944827. The next prime is 28944859. The reversal of 28944840 is 4844982.

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 7 ways as a sum of consecutive naturals, for example, 120484 + ... + 120723.

It is an arithmetic number, because the mean of its divisors is an integer number (2713590).

Almost surely, 2^28944840 is an apocalyptic number.

28944840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28944840 is an abundant number, since it is smaller than the sum of its proper divisors (57890040).

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

28944840 is a wasteful number, since it uses less digits than its factorization.

28944840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241221 (or 241217 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 28944840 is about 5380.0408920379. The cubic root of 28944840 is about 307.0367669858.

The spelling of 28944840 in words is "twenty-eight million, nine hundred forty-four thousand, eight hundred forty".