28912322 has 4 divisors (see below), whose sum is σ = 43368486. Its totient is φ = 14456160.

The previous prime is 28912321. The next prime is 28912327. The reversal of 28912322 is 22321982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22321982 = 2 ⋅11160991.

It can be written as a sum of positive squares in only one way, i.e., 25411681 + 3500641 = 5041^2 + 1871^2 .

It is not an unprimeable number, because it can be changed into a prime (28912321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7228079 + ... + 7228082.

Almost surely, 2^28912322 is an apocalyptic number.

28912322 is a deficient number, since it is larger than the sum of its proper divisors (14456164).

28912322 is a wasteful number, since it uses less digits than its factorization.

28912322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14456163.

The product of its digits is 3456, while the sum is 29.

The square root of 28912322 is about 5377.0179467805. The cubic root of 28912322 is about 306.9217440336.

The spelling of 28912322 in words is "twenty-eight million, nine hundred twelve thousand, three hundred twenty-two".