28491322 has 8 divisors (see below), whose sum is σ = 42954516. Its totient is φ = 14173152.

The previous prime is 28491301. The next prime is 28491329. The reversal of 28491322 is 22319482.

It can be written as a sum of positive squares in 2 ways, for example, as 19545241 + 8946081 = 4421^2 + 2991^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28491329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35763 + ... + 36550.

Almost surely, 2^28491322 is an apocalyptic number.

28491322 is a deficient number, since it is larger than the sum of its proper divisors (14463194).

28491322 is a wasteful number, since it uses less digits than its factorization.

28491322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72512.

The product of its digits is 6912, while the sum is 31.

The square root of 28491322 is about 5337.7262949687. The cubic root of 28491322 is about 305.4247312031.

The spelling of 28491322 in words is "twenty-eight million, four hundred ninety-one thousand, three hundred twenty-two".