28420904 has 32 divisors (see below), whose sum is σ = 54432000. Its totient is φ = 13909632.

The previous prime is 28420883. The next prime is 28420907. The reversal of 28420904 is 40902482.

It is not an unprimeable number, because it can be changed into a prime (28420907) 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, 127337 + ... + 127559.

It is an arithmetic number, because the mean of its divisors is an integer number (1701000).

Almost surely, 2^28420904 is an apocalyptic number.

It is an amenable number.

28420904 is a deficient number, since it is larger than the sum of its proper divisors (26011096).

28420904 is a wasteful number, since it uses less digits than its factorization.

28420904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497 (or 493 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28420904 is about 5331.1259598700. The cubic root of 28420904 is about 305.1728984751.

The spelling of 28420904 in words is "twenty-eight million, four hundred twenty thousand, nine hundred four".