71836009644 has 24 divisors (see below), whose sum is σ = 191562692608. Its totient is φ = 20524574160.

The previous prime is 71836009633. The next prime is 71836009673. The reversal of 71836009644 is 44690063817.

It is a super-2 number, since 2×71836009644² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71836009593 and 71836009602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427595212 + ... + 427595379.

Almost surely, 2^71836009644 is an apocalyptic number.

It is an amenable number.

71836009644 is an abundant number, since it is smaller than the sum of its proper divisors (119726682964).

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

71836009644 is a wasteful number, since it uses less digits than its factorization.

71836009644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855190605 (or 855190603 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 71836009644 in words is "seventy-one billion, eight hundred thirty-six million, nine thousand, six hundred forty-four".