28745685 has 48 divisors (see below), whose sum is σ = 52678080. Its totient is φ = 15033600.

The previous prime is 28745671. The next prime is 28745687. The reversal of 28745685 is 58654782.

28745685 is a `hidden beast` number, since 2 + 87 + 4 + 568 + 5 = 666.

It is not a de Polignac number, because 28745685 - 2⁴ = 28745669 is a prime.

It is a super-2 number, since 2×28745685² = 1652628812238450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

Its product of digits (537600) is a multiple of the sum of its prime factors (480).

It is a self number, because there is not a number n which added to its sum of digits gives 28745685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28745687) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 71485 + ... + 71885.

It is an arithmetic number, because the mean of its divisors is an integer number (1097460).

Almost surely, 2^28745685 is an apocalyptic number.

It is an amenable number.

28745685 is a deficient number, since it is larger than the sum of its proper divisors (23932395).

28745685 is an equidigital number, since it uses as much as digits as its factorization.

28745685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480 (or 468 counting only the distinct ones).

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

The square root of 28745685 is about 5361.5002564581. The cubic root of 28745685 is about 306.3309568008.

The spelling of 28745685 in words is "twenty-eight million, seven hundred forty-five thousand, six hundred eighty-five".