28126913 has 2 divisors, whose sum is σ = 28126914. Its totient is φ = 28126912.

The previous prime is 28126883. The next prime is 28126949. The reversal of 28126913 is 31962182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27793984 + 332929 = 5272^2 + 577^2 .

It is a cyclic number.

It is not a de Polignac number, because 28126913 - 2⁶ = 28126849 is a prime.

It is a super-2 number, since 2×28126913² = 1582246469819138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28126913.

It is not a weakly prime, because it can be changed into another prime (28126963) 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, 14063456 + 14063457.

It is an arithmetic number, because the mean of its divisors is an integer number (14063457).

Almost surely, 2^28126913 is an apocalyptic number.

It is an amenable number.

28126913 is a deficient number, since it is larger than the sum of its proper divisors (1).

28126913 is an equidigital number, since it uses as much as digits as its factorization.

28126913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 28126913 is about 5303.4812152020. The cubic root of 28126913 is about 304.1169945867.

The spelling of 28126913 in words is "twenty-eight million, one hundred twenty-six thousand, nine hundred thirteen".