28193773 has 8 divisors (see below), whose sum is σ = 29357496. Its totient is φ = 27052800.

The previous prime is 28193761. The next prime is 28193813. The reversal of 28193773 is 37739182.

It can be written as a sum of positive squares in 4 ways, for example, as 2812329 + 25381444 = 1677^2 + 5038^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28193773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28193743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3136 + ... + 8137.

It is an arithmetic number, because the mean of its divisors is an integer number (3669687).

Almost surely, 2^28193773 is an apocalyptic number.

It is an amenable number.

28193773 is a deficient number, since it is larger than the sum of its proper divisors (1163723).

28193773 is a wasteful number, since it uses less digits than its factorization.

28193773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11375.

The product of its digits is 63504, while the sum is 40.

The square root of 28193773 is about 5309.7808806014. The cubic root of 28193773 is about 304.3577743246.

The spelling of 28193773 in words is "twenty-eight million, one hundred ninety-three thousand, seven hundred seventy-three".