28070881 has 2 divisors, whose sum is σ = 28070882. Its totient is φ = 28070880.

The previous prime is 28070851. The next prime is 28070929. The reversal of 28070881 is 18807082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28037025 + 33856 = 5295^2 + 184^2 .

It is a cyclic number.

It is not a de Polignac number, because 28070881 - 2⁹ = 28070369 is a prime.

It is a super-2 number, since 2×28070881² = 1575948720232322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28070821) 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, 14035440 + 14035441.

It is an arithmetic number, because the mean of its divisors is an integer number (14035441).

Almost surely, 2^28070881 is an apocalyptic number.

It is an amenable number.

28070881 is a deficient number, since it is larger than the sum of its proper divisors (1).

28070881 is an equidigital number, since it uses as much as digits as its factorization.

28070881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 28070881 is about 5298.1960137390. The cubic root of 28070881 is about 303.9149151599.

The spelling of 28070881 in words is "twenty-eight million, seventy thousand, eight hundred eighty-one".