28146785 has 4 divisors (see below), whose sum is σ = 33776148. Its totient is φ = 22517424.

The previous prime is 28146761. The next prime is 28146793. The reversal of 28146785 is 58764182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19044496 + 9102289 = 4364^2 + 3017^2 .

It is a cyclic number.

It is not a de Polignac number, because 28146785 - 2⁶ = 28146721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2814674 + ... + 2814683.

It is an arithmetic number, because the mean of its divisors is an integer number (8444037).

Almost surely, 2^28146785 is an apocalyptic number.

It is an amenable number.

28146785 is a deficient number, since it is larger than the sum of its proper divisors (5629363).

28146785 is an equidigital number, since it uses as much as digits as its factorization.

28146785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5629362.

The product of its digits is 107520, while the sum is 41.

The square root of 28146785 is about 5305.3543708220. The cubic root of 28146785 is about 304.1885984895.

The spelling of 28146785 in words is "twenty-eight million, one hundred forty-six thousand, seven hundred eighty-five".