28924420 has 24 divisors (see below), whose sum is σ = 69418944. Its totient is φ = 9916896.

The previous prime is 28924381. The next prime is 28924447. The reversal of 28924420 is 2442982.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103162 + ... + 103441.

It is an arithmetic number, because the mean of its divisors is an integer number (2892456).

Almost surely, 2^28924420 is an apocalyptic number.

28924420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28924420 is an abundant number, since it is smaller than the sum of its proper divisors (40494524).

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

28924420 is a wasteful number, since it uses less digits than its factorization.

28924420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206619 (or 206617 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 28924420 is about 5378.1428021204. The cubic root of 28924420 is about 306.9645472541.

The spelling of 28924420 in words is "twenty-eight million, nine hundred twenty-four thousand, four hundred twenty".