28193505 has 8 divisors (see below), whose sum is σ = 45109632. Its totient is φ = 15036528.

The previous prime is 28193489. The next prime is 28193507. The reversal of 28193505 is 50539182.

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

It is not a de Polignac number, because 28193505 - 2⁴ = 28193489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28193507) 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 7 ways as a sum of consecutive naturals, for example, 939769 + ... + 939798.

It is an arithmetic number, because the mean of its divisors is an integer number (5638704).

Almost surely, 2^28193505 is an apocalyptic number.

It is an amenable number.

28193505 is a deficient number, since it is larger than the sum of its proper divisors (16916127).

28193505 is a wasteful number, since it uses less digits than its factorization.

28193505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1879575.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 28193505 is about 5309.7556440951. The cubic root of 28193505 is about 304.3568099492.

The spelling of 28193505 in words is "twenty-eight million, one hundred ninety-three thousand, five hundred five".