28312469 has 2 divisors, whose sum is σ = 28312470. Its totient is φ = 28312468.

The previous prime is 28312411. The next prime is 28312477. The reversal of 28312469 is 96421382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23406244 + 4906225 = 4838^2 + 2215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28312469 is a prime.

It is a super-2 number, since 2×28312469² = 1603191801751922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28312409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14156234 + 14156235.

It is an arithmetic number, because the mean of its divisors is an integer number (14156235).

Almost surely, 2^28312469 is an apocalyptic number.

It is an amenable number.

28312469 is a deficient number, since it is larger than the sum of its proper divisors (1).

28312469 is an equidigital number, since it uses as much as digits as its factorization.

28312469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 28312469 is about 5320.9462504333. The cubic root of 28312469 is about 304.7842925212.

The spelling of 28312469 in words is "twenty-eight million, three hundred twelve thousand, four hundred sixty-nine".