71585721444 has 24 divisors (see below), whose sum is σ = 167047797280. Its totient is φ = 23859843264.

The previous prime is 71585721421. The next prime is 71585721491. The reversal of 71585721444 is 44412758517.

It is a super-2 number, since 2×71585721444² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71585721393 and 71585721402.

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, 110074 + ... + 394065.

Almost surely, 2^71585721444 is an apocalyptic number.

It is an amenable number.

71585721444 is an abundant number, since it is smaller than the sum of its proper divisors (95462075836).

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

71585721444 is a wasteful number, since it uses less digits than its factorization.

71585721444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515979 (or 515977 counting only the distinct ones).

The product of its digits is 1254400, while the sum is 48.

The spelling of 71585721444 in words is "seventy-one billion, five hundred eighty-five million, seven hundred twenty-one thousand, four hundred forty-four".