28343505 has 32 divisors (see below), whose sum is σ = 49206528. Its totient is φ = 13875200.

The previous prime is 28343489. The next prime is 28343507. The reversal of 28343505 is 50534382.

It is not a de Polignac number, because 28343505 - 2⁴ = 28343489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28343507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9100 + ... + 11810.

It is an arithmetic number, because the mean of its divisors is an integer number (1537704).

Almost surely, 2^28343505 is an apocalyptic number.

It is an amenable number.

28343505 is a deficient number, since it is larger than the sum of its proper divisors (20863023).

28343505 is a wasteful number, since it uses less digits than its factorization.

28343505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 28343505 is about 5323.8618501986. The cubic root of 28343505 is about 304.8956195717.

Adding to 28343505 its reverse (50534382), we get a palindrome (78877887).

The spelling of 28343505 in words is "twenty-eight million, three hundred forty-three thousand, five hundred five".