28990845 has 32 divisors (see below), whose sum is σ = 55507200. Its totient is φ = 14271552.

The previous prime is 28990837. The next prime is 28990849. The reversal of 28990845 is 54809982.

It is not a de Polignac number, because 28990845 - 2³ = 28990837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28990845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28990849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6505 + ... + 10014.

It is an arithmetic number, because the mean of its divisors is an integer number (1734600).

Almost surely, 2^28990845 is an apocalyptic number.

It is an amenable number.

28990845 is a deficient number, since it is larger than the sum of its proper divisors (26516355).

28990845 is a wasteful number, since it uses less digits than its factorization.

28990845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16546 (or 16540 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 28990845 is about 5384.3147196277. The cubic root of 28990845 is about 307.1993492113.

The spelling of 28990845 in words is "twenty-eight million, nine hundred ninety thousand, eight hundred forty-five".