28204420 has 24 divisors (see below), whose sum is σ = 61141248. Its totient is φ = 10917600.

The previous prime is 28204409. The next prime is 28204439. The reversal of 28204420 is 2440282.

It is a junction number, because it is equal to n+sod(n) for n = 28204391 and 28204400.

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, 22126 + ... + 23365.

It is an arithmetic number, because the mean of its divisors is an integer number (2547552).

Almost surely, 2^28204420 is an apocalyptic number.

28204420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28204420 is an abundant number, since it is smaller than the sum of its proper divisors (32936828).

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

28204420 is a wasteful number, since it uses less digits than its factorization.

28204420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45531 (or 45529 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 28204420 is about 5310.7833697111. The cubic root of 28204420 is about 304.3960817126.

The spelling of 28204420 in words is "twenty-eight million, two hundred four thousand, four hundred twenty".