28115701 has 2 divisors, whose sum is σ = 28115702. Its totient is φ = 28115700.

The previous prime is 28115699. The next prime is 28115713. The reversal of 28115701 is 10751182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21613201 + 6502500 = 4649^2 + 2550^2 .

It is a cyclic number.

It is not a de Polignac number, because 28115701 - 2¹ = 28115699 is a prime.

Together with 28115699, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28110701) 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, 14057850 + 14057851.

It is an arithmetic number, because the mean of its divisors is an integer number (14057851).

Almost surely, 2^28115701 is an apocalyptic number.

It is an amenable number.

28115701 is a deficient number, since it is larger than the sum of its proper divisors (1).

28115701 is an equidigital number, since it uses as much as digits as its factorization.

28115701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 28115701 is about 5302.4240682918. The cubic root of 28115701 is about 304.0765799974.

Adding to 28115701 its reverse (10751182), we get a palindrome (38866883).

The spelling of 28115701 in words is "twenty-eight million, one hundred fifteen thousand, seven hundred one".