28925128 has 8 divisors (see below), whose sum is σ = 54234630. Its totient is φ = 14462560.

The previous prime is 28925123. The next prime is 28925129. The reversal of 28925128 is 82152982.

It can be written as a sum of positive squares in only one way, i.e., 22071204 + 6853924 = 4698^2 + 2618^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (28925123) 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, 1807813 + ... + 1807828.

Almost surely, 2^28925128 is an apocalyptic number.

It is an amenable number.

28925128 is a deficient number, since it is larger than the sum of its proper divisors (25309502).

28925128 is a wasteful number, since it uses less digits than its factorization.

28925128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3615647 (or 3615643 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 28925128 is about 5378.2086236962. The cubic root of 28925128 is about 306.9670518174.

The spelling of 28925128 in words is "twenty-eight million, nine hundred twenty-five thousand, one hundred twenty-eight".