28735285 has 4 divisors (see below), whose sum is σ = 34482348. Its totient is φ = 22988224.

The previous prime is 28735279. The next prime is 28735307. The reversal of 28735285 is 58253782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58253782 = 2 ⋅29126891.

It can be written as a sum of positive squares in 2 ways, for example, as 22212369 + 6522916 = 4713^2 + 2554^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28735285 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent 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, 2873524 + ... + 2873533.

It is an arithmetic number, because the mean of its divisors is an integer number (8620587).

Almost surely, 2^28735285 is an apocalyptic number.

It is an amenable number.

28735285 is a deficient number, since it is larger than the sum of its proper divisors (5747063).

28735285 is an equidigital number, since it uses as much as digits as its factorization.

28735285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5747062.

The product of its digits is 134400, while the sum is 40.

The square root of 28735285 is about 5360.5302909320. The cubic root of 28735285 is about 306.2940095021.

The spelling of 28735285 in words is "twenty-eight million, seven hundred thirty-five thousand, two hundred eighty-five".