71309263920 has 80 divisors (see below), whose sum is σ = 221086251360. Its totient is φ = 19013435392.

The previous prime is 71309263913. The next prime is 71309263999. The reversal of 71309263920 is 2936290317.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×71309263920² (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 (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2813866 + ... + 2839094.

It is an arithmetic number, because the mean of its divisors is an integer number (2763578142).

Almost surely, 2^71309263920 is an apocalyptic number.

It is an amenable number.

71309263920 is an abundant number, since it is smaller than the sum of its proper divisors (149776987440).

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

71309263920 is a wasteful number, since it uses less digits than its factorization.

71309263920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37022 (or 37016 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 42.

The spelling of 71309263920 in words is "seventy-one billion, three hundred nine million, two hundred sixty-three thousand, nine hundred twenty".