28911922 has 16 divisors (see below), whose sum is σ = 46838232. Its totient is φ = 13305600.

The previous prime is 28911919. The next prime is 28911941. The reversal of 28911922 is 22911982.

It can be written as a sum of positive squares in 4 ways, for example, as 22363441 + 6548481 = 4729^2 + 2559^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8922 + ... + 11722.

Almost surely, 2^28911922 is an apocalyptic number.

28911922 is a deficient number, since it is larger than the sum of its proper divisors (17926310).

28911922 is a wasteful number, since it uses less digits than its factorization.

28911922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3213.

The product of its digits is 5184, while the sum is 34.

The square root of 28911922 is about 5376.9807513139. The cubic root of 28911922 is about 306.9203286133.

The spelling of 28911922 in words is "twenty-eight million, nine hundred eleven thousand, nine hundred twenty-two".