28193605 has 12 divisors (see below), whose sum is σ = 37188396. Its totient is φ = 20504000.

The previous prime is 28193591. The next prime is 28193611. The reversal of 28193605 is 50639182.

It can be written as a sum of positive squares in 2 ways, for example, as 6235009 + 21958596 = 2497^2 + 4686^2 .

It is not a de Polignac number, because 28193605 - 2¹³ = 28185413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 22696 + ... + 23905.

It is an arithmetic number, because the mean of its divisors is an integer number (3099033).

Almost surely, 2^28193605 is an apocalyptic number.

It is an amenable number.

28193605 is a deficient number, since it is larger than the sum of its proper divisors (8994791).

28193605 is a wasteful number, since it uses less digits than its factorization.

28193605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46628 (or 46617 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 28193605 is about 5309.7650607160. The cubic root of 28193605 is about 304.3571697915.

The spelling of 28193605 in words is "twenty-eight million, one hundred ninety-three thousand, six hundred five".