28785465 has 12 divisors (see below), whose sum is σ = 49894884. Its totient is φ = 15352224.

The previous prime is 28785457. The next prime is 28785469. The reversal of 28785465 is 56458782.

It can be written as a sum of positive squares in 2 ways, for example, as 5253264 + 23532201 = 2292^2 + 4851^2 .

It is not a de Polignac number, because 28785465 - 2³ = 28785457 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: 639677 = 28785465 / (2 + 8 + 7 + 8 + 5 + 4 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 28785465.

It is not an unprimeable number, because it can be changed into a prime (28785469) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319794 + ... + 319883.

It is an arithmetic number, because the mean of its divisors is an integer number (4157907).

Almost surely, 2^28785465 is an apocalyptic number.

It is an amenable number.

28785465 is a deficient number, since it is larger than the sum of its proper divisors (21109419).

28785465 is a wasteful number, since it uses less digits than its factorization.

28785465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639688 (or 639685 counting only the distinct ones).

The product of its digits is 537600, while the sum is 45.

The square root of 28785465 is about 5365.2087564232. The cubic root of 28785465 is about 306.4721980412.

The spelling of 28785465 in words is "twenty-eight million, seven hundred eighty-five thousand, four hundred sixty-five".