71631992930 has 16 divisors (see below), whose sum is σ = 129006904824. Its totient is φ = 28637393280.

The previous prime is 71631992893. The next prime is 71631992959. The reversal of 71631992930 is 3929913617.

It can be written as a sum of positive squares in 4 ways, for example, as 52199911729 + 19432081201 = 228473^2 + 139399^2 .

It is a super-2 number, since 2×71631992930² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1905947 + ... + 1943166.

Almost surely, 2^71631992930 is an apocalyptic number.

71631992930 is a deficient number, since it is larger than the sum of its proper divisors (57374911894).

71631992930 is a wasteful number, since it uses less digits than its factorization.

71631992930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3850981.

The product of its (nonzero) digits is 551124, while the sum is 50.

The spelling of 71631992930 in words is "seventy-one billion, six hundred thirty-one million, nine hundred ninety-two thousand, nine hundred thirty".