71993520 has 60 divisors (see below), whose sum is σ = 241780656. Its totient is φ = 19198080.

The previous prime is 71993513. The next prime is 71993531. The reversal of 71993520 is 2539917.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49276 + ... + 50715.

Almost surely, 2^71993520 is an apocalyptic number.

It is an amenable number.

71993520 is an abundant number, since it is smaller than the sum of its proper divisors (169787136).

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

71993520 is a wasteful number, since it uses less digits than its factorization.

71993520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100010 (or 100001 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 71993520 is about 8484.8995279850. The cubic root of 71993520 is about 416.0042837330.

The spelling of 71993520 in words is "seventy-one million, nine hundred ninety-three thousand, five hundred twenty".