28764647 has 2 divisors, whose sum is σ = 28764648. Its totient is φ = 28764646.

The previous prime is 28764601. The next prime is 28764649. The reversal of 28764647 is 74646782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28764647 - 2¹² = 28760551 is a prime.

Together with 28764649, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28764598 and 28764607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28764649) 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, 14382323 + 14382324.

It is an arithmetic number, because the mean of its divisors is an integer number (14382324).

Almost surely, 2^28764647 is an apocalyptic number.

28764647 is a deficient number, since it is larger than the sum of its proper divisors (1).

28764647 is an equidigital number, since it uses as much as digits as its factorization.

28764647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 451584, while the sum is 44.

The square root of 28764647 is about 5363.2683132583. The cubic root of 28764647 is about 306.3982987439.

The spelling of 28764647 in words is "twenty-eight million, seven hundred sixty-four thousand, six hundred forty-seven".