71530639492 has 96 divisors (see below), whose sum is σ = 152409261312. Its totient is φ = 29029625856.

The previous prime is 71530639487. The next prime is 71530639493. The reversal of 71530639492 is 29493603517.

It is a super-2 number, since 2×71530639492² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71530639493) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 833368 + ... + 915184.

It is an arithmetic number, because the mean of its divisors is an integer number (1587596472).

Almost surely, 2^71530639492 is an apocalyptic number.

It is an amenable number.

71530639492 is an abundant number, since it is smaller than the sum of its proper divisors (80878621820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71530639492 is a wasteful number, since it uses less digits than its factorization.

71530639492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81917 (or 81915 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 49.

The spelling of 71530639492 in words is "seventy-one billion, five hundred thirty million, six hundred thirty-nine thousand, four hundred ninety-two".