71999712 has 96 divisors (see below), whose sum is σ = 211680000. Its totient is φ = 23808384.

The previous prime is 71999671. The next prime is 71999771. The reversal of 71999712 is 21799917.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144039 + ... + 144537.

It is an arithmetic number, because the mean of its divisors is an integer number (2205000).

Almost surely, 2^71999712 is an apocalyptic number.

71999712 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71999712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105840000).

71999712 is an abundant number, since it is smaller than the sum of its proper divisors (139680288).

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

71999712 is a wasteful number, since it uses less digits than its factorization.

71999712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685 (or 671 counting only the distinct ones).

The product of its digits is 71442, while the sum is 45.

The square root of 71999712 is about 8485.2644036589. The cubic root of 71999712 is about 416.0162099206.

The spelling of 71999712 in words is "seventy-one million, nine hundred ninety-nine thousand, seven hundred twelve".