71628715431 has 36 divisors (see below), whose sum is σ = 129613876392. Its totient is φ = 37782176544.

The previous prime is 71628715427. The next prime is 71628715453. The reversal of 71628715431 is 13451782617.

71628715431 is a `hidden beast` number, since 7 + 1 + 628 + 7 + 15 + 4 + 3 + 1 = 666.

It is not a de Polignac number, because 71628715431 - 2² = 71628715427 is a prime.

It is a super-2 number, since 2×71628715431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71628715031) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6241321 + ... + 6252786.

Almost surely, 2^71628715431 is an apocalyptic number.

71628715431 is a deficient number, since it is larger than the sum of its proper divisors (57985160961).

71628715431 is a wasteful number, since it uses less digits than its factorization.

71628715431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12494140 (or 12494130 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The spelling of 71628715431 in words is "seventy-one billion, six hundred twenty-eight million, seven hundred fifteen thousand, four hundred thirty-one".