28647919 has 2 divisors, whose sum is σ = 28647920. Its totient is φ = 28647918.

The previous prime is 28647893. The next prime is 28647929. The reversal of 28647919 is 91974682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28647919 - 2⁷ = 28647791 is a prime.

It is a super-2 number, since 2×28647919² = 1641406526061122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28647929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14323959 + 14323960.

It is an arithmetic number, because the mean of its divisors is an integer number (14323960).

Almost surely, 2^28647919 is an apocalyptic number.

28647919 is a deficient number, since it is larger than the sum of its proper divisors (1).

28647919 is an equidigital number, since it uses as much as digits as its factorization.

28647919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The square root of 28647919 is about 5352.3750802798. The cubic root of 28647919 is about 305.9832783093.

It can be divided in two parts, 286 and 47919, that added together give a triangular number (48205 = T₃₁₀).

The spelling of 28647919 in words is "twenty-eight million, six hundred forty-seven thousand, nine hundred nineteen".