28660905 has 64 divisors (see below), whose sum is σ = 62737920. Its totient is φ = 12089088.

The previous prime is 28660889. The next prime is 28660909. The reversal of 28660905 is 50906682.

It is not a de Polignac number, because 28660905 - 2⁴ = 28660889 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28660905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28660909) 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 in 63 ways as a sum of consecutive naturals, for example, 11119 + ... + 13451.

It is an arithmetic number, because the mean of its divisors is an integer number (980280).

Almost surely, 2^28660905 is an apocalyptic number.

It is an amenable number.

28660905 is an abundant number, since it is smaller than the sum of its proper divisors (34077015).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28660905 is a wasteful number, since it uses less digits than its factorization.

28660905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2367 (or 2361 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 28660905 is about 5353.5880491498. The cubic root of 28660905 is about 306.0295050366.

The spelling of 28660905 in words is "twenty-eight million, six hundred sixty thousand, nine hundred five".