28225784 has 32 divisors (see below), whose sum is σ = 55693440. Its totient is φ = 13384800.

The previous prime is 28225741. The next prime is 28225793. The reversal of 28225784 is 48752282.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23519 + ... + 24689.

It is an arithmetic number, because the mean of its divisors is an integer number (1740420).

Almost surely, 2^28225784 is an apocalyptic number.

It is an amenable number.

28225784 is a deficient number, since it is larger than the sum of its proper divisors (27467656).

28225784 is a wasteful number, since it uses less digits than its factorization.

28225784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331 (or 1327 counting only the distinct ones).

The product of its digits is 71680, while the sum is 38.

The square root of 28225784 is about 5312.7943683150. The cubic root of 28225784 is about 304.4729192745.

The spelling of 28225784 in words is "twenty-eight million, two hundred twenty-five thousand, seven hundred eighty-four".