28281722 has 16 divisors (see below), whose sum is σ = 49473600. Its totient is φ = 12120444.

The previous prime is 28281691. The next prime is 28281731. The reversal of 28281722 is 22718282.

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, 19928 + ... + 21299.

It is an arithmetic number, because the mean of its divisors is an integer number (3092100).

Almost surely, 2^28281722 is an apocalyptic number.

28281722 is a deficient number, since it is larger than the sum of its proper divisors (21191878).

28281722 is an equidigital number, since it uses as much as digits as its factorization.

28281722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41250 (or 41236 counting only the distinct ones).

The product of its digits is 7168, while the sum is 32.

The square root of 28281722 is about 5318.0562238472. The cubic root of 28281722 is about 304.6739218687.

The spelling of 28281722 in words is "twenty-eight million, two hundred eighty-one thousand, seven hundred twenty-two".