28837885 has 4 divisors (see below), whose sum is σ = 34605468. Its totient is φ = 23070304.

The previous prime is 28837873. The next prime is 28837901. The reversal of 28837885 is 58873882.

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 17189316 + 11648569 = 4146^2 + 3413^2 .

It is a cyclic number.

It is not a de Polignac number, because 28837885 - 2⁹ = 28837373 is a prime.

It is a super-2 number, since 2×28837885² = 1663247222546450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) 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, 2883784 + ... + 2883793.

It is an arithmetic number, because the mean of its divisors is an integer number (8651367).

Almost surely, 2^28837885 is an apocalyptic number.

It is an amenable number.

28837885 is a deficient number, since it is larger than the sum of its proper divisors (5767583).

28837885 is an equidigital number, since it uses as much as digits as its factorization.

28837885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5767582.

The product of its digits is 860160, while the sum is 49.

The square root of 28837885 is about 5370.0917124384. The cubic root of 28837885 is about 306.6581197733.

The spelling of 28837885 in words is "twenty-eight million, eight hundred thirty-seven thousand, eight hundred eighty-five".