28215071 has 2 divisors, whose sum is σ = 28215072. Its totient is φ = 28215070.

The previous prime is 28215067. The next prime is 28215073. The reversal of 28215071 is 17051282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28215071 - 2² = 28215067 is a prime.

Together with 28215073, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28215071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28215073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14107535 + 14107536.

It is an arithmetic number, because the mean of its divisors is an integer number (14107536).

Almost surely, 2^28215071 is an apocalyptic number.

28215071 is a deficient number, since it is larger than the sum of its proper divisors (1).

28215071 is an equidigital number, since it uses as much as digits as its factorization.

28215071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 28215071 is about 5311.7860461430. The cubic root of 28215071 is about 304.4343938475.

The spelling of 28215071 in words is "twenty-eight million, two hundred fifteen thousand, seventy-one".