28343805 has 40 divisors (see below), whose sum is σ = 52972512. Its totient is φ = 12940704.

The previous prime is 28343789. The next prime is 28343807. The reversal of 28343805 is 50834382.

It is not a de Polignac number, because 28343805 - 2⁴ = 28343789 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28343807) 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 39 ways as a sum of consecutive naturals, for example, 35622 + ... + 36408.

Almost surely, 2^28343805 is an apocalyptic number.

It is an amenable number.

28343805 is a deficient number, since it is larger than the sum of its proper divisors (24628707).

28343805 is an frugal number, since it uses more digits than its factorization.

28343805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823 (or 802 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 28343805 is about 5323.8900251602. The cubic root of 28343805 is about 304.8966952839.

The spelling of 28343805 in words is "twenty-eight million, three hundred forty-three thousand, eight hundred five".