28073225 has 12 divisors (see below), whose sum is σ = 36325056. Its totient is φ = 21481680.

The previous prime is 28073207. The next prime is 28073231. The reversal of 28073225 is 52237082.

It is not a de Polignac number, because 28073225 - 2¹⁰ = 28072201 is a prime.

It is a super-4 number, since 4×28073225⁴ (a number of 31 digits) contains 4444 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23837 + ... + 24986.

It is an arithmetic number, because the mean of its divisors is an integer number (3027088).

Almost surely, 2^28073225 is an apocalyptic number.

28073225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28073225 is a deficient number, since it is larger than the sum of its proper divisors (8251831).

28073225 is a wasteful number, since it uses less digits than its factorization.

28073225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48856 (or 48851 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 28073225 is about 5298.4172164902. The cubic root of 28073225 is about 303.9233741835.

The spelling of 28073225 in words is "twenty-eight million, seventy-three thousand, two hundred twenty-five".