28343885 has 8 divisors (see below), whose sum is σ = 34363896. Its totient is φ = 22440960.

The previous prime is 28343873. The next prime is 28343891. The reversal of 28343885 is 58834382.

It can be written as a sum of positive squares in 4 ways, for example, as 8219689 + 20124196 = 2867^2 + 4486^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-28343885 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 28736 + ... + 29705.

It is an arithmetic number, because the mean of its divisors is an integer number (4295487).

Almost surely, 2^28343885 is an apocalyptic number.

It is an amenable number.

28343885 is a deficient number, since it is larger than the sum of its proper divisors (6020011).

28343885 is an equidigital number, since it uses as much as digits as its factorization.

28343885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58543.

The product of its digits is 184320, while the sum is 41.

The square root of 28343885 is about 5323.8975384581. The cubic root of 28343885 is about 304.8969821392.

The spelling of 28343885 in words is "twenty-eight million, three hundred forty-three thousand, eight hundred eighty-five".