28448513 has 2 divisors, whose sum is σ = 28448514. Its totient is φ = 28448512.

The previous prime is 28448503. The next prime is 28448521. The reversal of 28448513 is 31584482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17205904 + 11242609 = 4148^2 + 3353^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28448513 is a prime.

It is a super-2 number, since 2×28448513² = 1618635783822338, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28448503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14224256 + 14224257.

It is an arithmetic number, because the mean of its divisors is an integer number (14224257).

Almost surely, 2^28448513 is an apocalyptic number.

It is an amenable number.

28448513 is a deficient number, since it is larger than the sum of its proper divisors (1).

28448513 is an equidigital number, since it uses as much as digits as its factorization.

28448513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30720, while the sum is 35.

The square root of 28448513 is about 5333.7147467783. The cubic root of 28448513 is about 305.2716848209.

The spelling of 28448513 in words is "twenty-eight million, four hundred forty-eight thousand, five hundred thirteen".