28328722 has 4 divisors (see below), whose sum is σ = 42493086. Its totient is φ = 14164360.

The previous prime is 28328693. The next prime is 28328731. The reversal of 28328722 is 22782382.

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., 26842761 + 1485961 = 5181^2 + 1219^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7082179 + ... + 7082182.

Almost surely, 2^28328722 is an apocalyptic number.

28328722 is a deficient number, since it is larger than the sum of its proper divisors (14164364).

28328722 is a wasteful number, since it uses less digits than its factorization.

28328722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14164363.

The product of its digits is 21504, while the sum is 34.

The square root of 28328722 is about 5322.4732972557. The cubic root of 28328722 is about 304.8426026543.

The spelling of 28328722 in words is "twenty-eight million, three hundred twenty-eight thousand, seven hundred twenty-two".