28938047 has 2 divisors, whose sum is σ = 28938048. Its totient is φ = 28938046.

The previous prime is 28938001. The next prime is 28938073. The reversal of 28938047 is 74083982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28938047 - 2¹⁸ = 28675903 is a prime.

It is equal to p_1796099 and since 28938047 and 1796099 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 28937995 and 28938013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28931047) 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, 14469023 + 14469024.

It is an arithmetic number, because the mean of its divisors is an integer number (14469024).

Almost surely, 2^28938047 is an apocalyptic number.

28938047 is a deficient number, since it is larger than the sum of its proper divisors (1).

28938047 is an equidigital number, since it uses as much as digits as its factorization.

28938047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 28938047 is about 5379.4095400889. The cubic root of 28938047 is about 307.0127458483.

The spelling of 28938047 in words is "twenty-eight million, nine hundred thirty-eight thousand, forty-seven".