28190773 has 4 divisors (see below), whose sum is σ = 30359308. Its totient is φ = 26022240.

The previous prime is 28190759. The next prime is 28190803. The reversal of 28190773 is 37709182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8892324 + 19298449 = 2982^2 + 4393^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28190773 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 (28190713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1084248 + ... + 1084273.

It is an arithmetic number, because the mean of its divisors is an integer number (7589827).

Almost surely, 2^28190773 is an apocalyptic number.

It is an amenable number.

28190773 is a deficient number, since it is larger than the sum of its proper divisors (2168535).

28190773 is a wasteful number, since it uses less digits than its factorization.

28190773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2168534.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 28190773 is about 5309.4983755530. The cubic root of 28190773 is about 304.3469787291.

The spelling of 28190773 in words is "twenty-eight million, one hundred ninety thousand, seven hundred seventy-three".