28645885 has 8 divisors (see below), whose sum is σ = 34409016. Its totient is φ = 22894080.

The previous prime is 28645861. The next prime is 28645909. The reversal of 28645885 is 58854682.

It is an interprime number because it is at equal distance from previous prime (28645861) and next prime (28645909).

It can be written as a sum of positive squares in 4 ways, for example, as 1585081 + 27060804 = 1259^2 + 5202^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28645885 - 2¹¹ = 28643837 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 4437 + ... + 8773.

It is an arithmetic number, because the mean of its divisors is an integer number (4301127).

Almost surely, 2^28645885 is an apocalyptic number.

It is an amenable number.

28645885 is a deficient number, since it is larger than the sum of its proper divisors (5763131).

28645885 is a wasteful number, since it uses less digits than its factorization.

28645885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5663.

The product of its digits is 614400, while the sum is 46.

The square root of 28645885 is about 5352.1850678017. The cubic root of 28645885 is about 305.9760365417.

The spelling of 28645885 in words is "twenty-eight million, six hundred forty-five thousand, eight hundred eighty-five".