28523513 has 2 divisors, whose sum is σ = 28523514. Its totient is φ = 28523512.

The previous prime is 28523507. The next prime is 28523527. The reversal of 28523513 is 31532582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26759929 + 1763584 = 5173^2 + 1328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28523513 is a prime.

It is a super-2 number, since 2×28523513² = 1627181587722338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28523543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14261756 + 14261757.

It is an arithmetic number, because the mean of its divisors is an integer number (14261757).

Almost surely, 2^28523513 is an apocalyptic number.

It is an amenable number.

28523513 is a deficient number, since it is larger than the sum of its proper divisors (1).

28523513 is an equidigital number, since it uses as much as digits as its factorization.

28523513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 29.

The square root of 28523513 is about 5340.7408662095. The cubic root of 28523513 is about 305.5397162380.

The spelling of 28523513 in words is "twenty-eight million, five hundred twenty-three thousand, five hundred thirteen".