28981904 has 40 divisors (see below), whose sum is σ = 66394560. Its totient is φ = 11991168.

The previous prime is 28981891. The next prime is 28981907. The reversal of 28981904 is 40918982.

It is not an unprimeable number, because it can be changed into a prime (28981907) 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, 1214 + ... + 7709.

It is an arithmetic number, because the mean of its divisors is an integer number (1659864).

Almost surely, 2^28981904 is an apocalyptic number.

It is an amenable number.

28981904 is an abundant number, since it is smaller than the sum of its proper divisors (37412656).

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

28981904 is a wasteful number, since it uses less digits than its factorization.

28981904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8967 (or 8961 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 28981904 is about 5383.4843735261. The cubic root of 28981904 is about 307.1677650819.

The spelling of 28981904 in words is "twenty-eight million, nine hundred eighty-one thousand, nine hundred four".