71731680 has 48 divisors (see below), whose sum is σ = 225956304. Its totient is φ = 19128320.

The previous prime is 71731679. The next prime is 71731717. The reversal of 71731680 is 8613717.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74241 + ... + 75200.

It is an arithmetic number, because the mean of its divisors is an integer number (4707423).

Almost surely, 2^71731680 is an apocalyptic number.

It is an amenable number.

71731680 is an abundant number, since it is smaller than the sum of its proper divisors (154224624).

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

71731680 is a wasteful number, since it uses less digits than its factorization.

71731680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149459 (or 149451 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 71731680 is about 8469.4557086037. The cubic root of 71731680 is about 415.4993360460.

The spelling of 71731680 in words is "seventy-one million, seven hundred thirty-one thousand, six hundred eighty".