71858581988 has 12 divisors (see below), whose sum is σ = 125755062972. Its totient is φ = 35928564000.

The previous prime is 71858581967. The next prime is 71858582053. The reversal of 71858581988 is 88918585817.

It can be written as a sum of positive squares in 2 ways, for example, as 59395538944 + 12463043044 = 243712^2 + 111638^2 .

It is a super-2 number, since 2×71858581988² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83738 + ... + 388238.

It is an arithmetic number, because the mean of its divisors is an integer number (10479588581).

Almost surely, 2^71858581988 is an apocalyptic number.

It is an amenable number.

71858581988 is a deficient number, since it is larger than the sum of its proper divisors (53896480984).

71858581988 is a wasteful number, since it uses less digits than its factorization.

71858581988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363502 (or 363500 counting only the distinct ones).

The product of its digits is 51609600, while the sum is 68.

The spelling of 71858581988 in words is "seventy-one billion, eight hundred fifty-eight million, five hundred eighty-one thousand, nine hundred eighty-eight".