71028689 has 2 divisors, whose sum is σ = 71028690. Its totient is φ = 71028688.

The previous prime is 71028611. The next prime is 71028691. The reversal of 71028689 is 98682017.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45697600 + 25331089 = 6760^2 + 5033^2 .

It is a cyclic number.

It is not a de Polignac number, because 71028689 - 2¹² = 71024593 is a prime.

It is a super-2 number, since 2×71028689² = 10090149322117442, which contains 22 as substring.

Together with 71028691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71028589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35514344 + 35514345.

It is an arithmetic number, because the mean of its divisors is an integer number (35514345).

Almost surely, 2^71028689 is an apocalyptic number.

It is an amenable number.

71028689 is a deficient number, since it is larger than the sum of its proper divisors (1).

71028689 is an equidigital number, since it uses as much as digits as its factorization.

71028689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 71028689 is about 8427.8519801904. The cubic root of 71028689 is about 414.1375401645.

It can be divided in two parts, 71028 and 689, that added together give a palindrome (71717).

The spelling of 71028689 in words is "seventy-one million, twenty-eight thousand, six hundred eighty-nine".