28788322 has 4 divisors (see below), whose sum is σ = 43182486. Its totient is φ = 14394160.

The previous prime is 28788313. The next prime is 28788323. The reversal of 28788322 is 22388782.

It is a happy number.

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., 22382361 + 6405961 = 4731^2 + 2531^2 .

It is not an unprimeable number, because it can be changed into a prime (28788323) by changing a digit.

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, 7197079 + ... + 7197082.

Almost surely, 2^28788322 is an apocalyptic number.

28788322 is a deficient number, since it is larger than the sum of its proper divisors (14394164).

28788322 is a wasteful number, since it uses less digits than its factorization.

28788322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14394163.

The product of its digits is 86016, while the sum is 40.

The square root of 28788322 is about 5365.4750022715. The cubic root of 28788322 is about 306.4823369788.

The spelling of 28788322 in words is "twenty-eight million, seven hundred eighty-eight thousand, three hundred twenty-two".