28215849371 has 2 divisors, whose sum is σ = 28215849372. Its totient is φ = 28215849370.

The previous prime is 28215849317. The next prime is 28215849377. The reversal of 28215849371 is 17394851282.

Together with previous prime (28215849317) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28215849371 - 2²² = 28211655067 is a prime.

It is a super-2 number, since 2×28215849371² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28215849377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14107924685 + 14107924686.

It is an arithmetic number, because the mean of its divisors is an integer number (14107924686).

Almost surely, 2^28215849371 is an apocalyptic number.

28215849371 is a deficient number, since it is larger than the sum of its proper divisors (1).

28215849371 is an equidigital number, since it uses as much as digits as its factorization.

28215849371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 50.

The spelling of 28215849371 in words is "twenty-eight billion, two hundred fifteen million, eight hundred forty-nine thousand, three hundred seventy-one".