28947578 has 24 divisors (see below), whose sum is σ = 48197376. Its totient is φ = 12931400.

The previous prime is 28947577. The next prime is 28947601. The reversal of 28947578 is 87574982.

It is not an unprimeable number, because it can be changed into a prime (28947577) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151463 + ... + 151653.

It is an arithmetic number, because the mean of its divisors is an integer number (2008224).

Almost surely, 2^28947578 is an apocalyptic number.

28947578 is a deficient number, since it is larger than the sum of its proper divisors (19249798).

28947578 is a wasteful number, since it uses less digits than its factorization.

28947578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370 (or 287 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 50.

The square root of 28947578 is about 5380.2953450531. The cubic root of 28947578 is about 307.0464479302.

The spelling of 28947578 in words is "twenty-eight million, nine hundred forty-seven thousand, five hundred seventy-eight".