28808685 has 12 divisors (see below), whose sum is σ = 49935132. Its totient is φ = 15364608.

The previous prime is 28808671. The next prime is 28808699. The reversal of 28808685 is 58680882.

It is an interprime number because it is at equal distance from previous prime (28808671) and next prime (28808699).

It can be written as a sum of positive squares in 2 ways, for example, as 3437316 + 25371369 = 1854^2 + 5037^2 .

It is not a de Polignac number, because 28808685 - 2¹⁸ = 28546541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 640193 = 28808685 / (2 + 8 + 8 + 0 + 8 + 6 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 28808685.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 320052 + ... + 320141.

It is an arithmetic number, because the mean of its divisors is an integer number (4161261).

Almost surely, 2^28808685 is an apocalyptic number.

It is an amenable number.

28808685 is a deficient number, since it is larger than the sum of its proper divisors (21126447).

28808685 is a wasteful number, since it uses less digits than its factorization.

28808685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640204 (or 640201 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 45.

The square root of 28808685 is about 5367.3722621037. The cubic root of 28808685 is about 306.5545818858.

The spelling of 28808685 in words is "twenty-eight million, eight hundred eight thousand, six hundred eighty-five".