28225420 has 12 divisors (see below), whose sum is σ = 59273424. Its totient is φ = 11290160.

The previous prime is 28225409. The next prime is 28225433. The reversal of 28225420 is 2452282.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705616 + ... + 705655.

It is an arithmetic number, because the mean of its divisors is an integer number (4939452).

Almost surely, 2^28225420 is an apocalyptic number.

28225420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28225420 is an abundant number, since it is smaller than the sum of its proper divisors (31048004).

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

28225420 is a wasteful number, since it uses less digits than its factorization.

28225420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411280 (or 1411278 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 28225420 is about 5312.7601112793. The cubic root of 28225420 is about 304.4716104403.

The spelling of 28225420 in words is "twenty-eight million, two hundred twenty-five thousand, four hundred twenty".