28751969 has 2 divisors, whose sum is σ = 28751970. Its totient is φ = 28751968.

The previous prime is 28751941. The next prime is 28751977. The reversal of 28751969 is 96915782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25000000 + 3751969 = 5000^2 + 1937^2 .

It is a cyclic number.

It is not a de Polignac number, because 28751969 - 2⁸ = 28751713 is a prime.

It is a super-2 number, since 2×28751969² = 1653351442753922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28751929) 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, 14375984 + 14375985.

It is an arithmetic number, because the mean of its divisors is an integer number (14375985).

Almost surely, 2^28751969 is an apocalyptic number.

It is an amenable number.

28751969 is a deficient number, since it is larger than the sum of its proper divisors (1).

28751969 is an equidigital number, since it uses as much as digits as its factorization.

28751969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 28751969 is about 5362.0862544349. The cubic root of 28751969 is about 306.3532771766.

The spelling of 28751969 in words is "twenty-eight million, seven hundred fifty-one thousand, nine hundred sixty-nine".