28785345 has 16 divisors (see below), whose sum is σ = 46226112. Its totient is φ = 15295680.

The previous prime is 28785331. The next prime is 28785347. The reversal of 28785345 is 54358782.

It is a de Polignac number, because none of the positive numbers 2^k-28785345 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28785297 and 28785306.

It is not an unprimeable number, because it can be changed into a prime (28785347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 855 + ... + 7635.

It is an arithmetic number, because the mean of its divisors is an integer number (2889132).

Almost surely, 2^28785345 is an apocalyptic number.

It is an amenable number.

28785345 is a deficient number, since it is larger than the sum of its proper divisors (17440767).

28785345 is a wasteful number, since it uses less digits than its factorization.

28785345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7072.

The product of its digits is 268800, while the sum is 42.

The square root of 28785345 is about 5365.1975732493. The cubic root of 28785345 is about 306.4717721698.

The spelling of 28785345 in words is "twenty-eight million, seven hundred eighty-five thousand, three hundred forty-five".