28320741 has 6 divisors (see below), whose sum is σ = 40907750. Its totient is φ = 18880488.

The previous prime is 28320737. The next prime is 28320749. The reversal of 28320741 is 14702382.

It can be written as a sum of positive squares in only one way, i.e., 21818241 + 6502500 = 4671^2 + 2550^2 .

It is not a de Polignac number, because 28320741 - 2² = 28320737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28320749) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1573366 + ... + 1573383.

Almost surely, 2^28320741 is an apocalyptic number.

It is an amenable number.

28320741 is a deficient number, since it is larger than the sum of its proper divisors (12587009).

28320741 is a wasteful number, since it uses less digits than its factorization.

28320741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3146755 (or 3146752 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 28320741 is about 5321.7234990180. The cubic root of 28320741 is about 304.8139723791.

The spelling of 28320741 in words is "twenty-eight million, three hundred twenty thousand, seven hundred forty-one".