28427722 has 4 divisors (see below), whose sum is σ = 42641586. Its totient is φ = 14213860.

The previous prime is 28427717. The next prime is 28427741. The reversal of 28427722 is 22772482.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14447601 + 13980121 = 3801^2 + 3739^2 .

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 as a sum of consecutive naturals, namely, 7106929 + ... + 7106932.

Almost surely, 2^28427722 is an apocalyptic number.

28427722 is a deficient number, since it is larger than the sum of its proper divisors (14213864).

28427722 is a wasteful number, since it uses less digits than its factorization.

28427722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14213863.

The product of its digits is 25088, while the sum is 34.

The square root of 28427722 is about 5331.7653736825. The cubic root of 28427722 is about 305.1972995575.

The spelling of 28427722 in words is "twenty-eight million, four hundred twenty-seven thousand, seven hundred twenty-two".