71028456631 has 4 divisors (see below), whose sum is σ = 77485589064. Its totient is φ = 64571324200.

The previous prime is 71028456601. The next prime is 71028456677. The reversal of 71028456631 is 13665482017.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13665482017 = 11 ⋅1242316547.

It is a cyclic number.

It is not a de Polignac number, because 71028456631 - 2⁹ = 71028456119 is a prime.

It is a super-2 number, since 2×71028456631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71028456601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3228566200 + ... + 3228566221.

It is an arithmetic number, because the mean of its divisors is an integer number (19371397266).

Almost surely, 2^71028456631 is an apocalyptic number.

71028456631 is a deficient number, since it is larger than the sum of its proper divisors (6457132433).

71028456631 is a wasteful number, since it uses less digits than its factorization.

71028456631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6457132432.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 71028456631 in words is "seventy-one billion, twenty-eight million, four hundred fifty-six thousand, six hundred thirty-one".