71936720 has 20 divisors (see below), whose sum is σ = 167253060. Its totient is φ = 28774656.

The previous prime is 71936719. The next prime is 71936731. The reversal of 71936720 is 2763917.

It can be written as a sum of positive squares in 2 ways, for example, as 44142736 + 27793984 = 6644^2 + 5272^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449525 + ... + 449684.

It is an arithmetic number, because the mean of its divisors is an integer number (8362653).

Almost surely, 2^71936720 is an apocalyptic number.

It is an amenable number.

71936720 is an abundant number, since it is smaller than the sum of its proper divisors (95316340).

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

71936720 is a wasteful number, since it uses less digits than its factorization.

71936720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899222 (or 899216 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 71936720 is about 8481.5517448165. The cubic root of 71936720 is about 415.8948513833.

The spelling of 71936720 in words is "seventy-one million, nine hundred thirty-six thousand, seven hundred twenty".