28742113 has 2 divisors, whose sum is σ = 28742114. Its totient is φ = 28742112.

The previous prime is 28742099. The next prime is 28742123. The reversal of 28742113 is 31124782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20493729 + 8248384 = 4527^2 + 2872^2 .

It is a cyclic number.

It is not a de Polignac number, because 28742113 - 2¹⁷ = 28611041 is a prime.

It is a super-2 number, since 2×28742113² = 1652218119409538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28742123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14371056 + 14371057.

It is an arithmetic number, because the mean of its divisors is an integer number (14371057).

Almost surely, 2^28742113 is an apocalyptic number.

It is an amenable number.

28742113 is a deficient number, since it is larger than the sum of its proper divisors (1).

28742113 is an equidigital number, since it uses as much as digits as its factorization.

28742113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 28742113 is about 5361.1671303924. The cubic root of 28742113 is about 306.3182678297.

Adding to 28742113 its reverse (31124782), we get a palindrome (59866895).

The spelling of 28742113 in words is "twenty-eight million, seven hundred forty-two thousand, one hundred thirteen".