71447920 has 20 divisors (see below), whose sum is σ = 166116600. Its totient is φ = 28579136.

The previous prime is 71447917. The next prime is 71447921. The reversal of 71447920 is 2974417.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71447921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446470 + ... + 446629.

It is an arithmetic number, because the mean of its divisors is an integer number (8305830).

Almost surely, 2^71447920 is an apocalyptic number.

It is an amenable number.

71447920 is an abundant number, since it is smaller than the sum of its proper divisors (94668680).

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

71447920 is a wasteful number, since it uses less digits than its factorization.

71447920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893112 (or 893106 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 71447920 is about 8452.6871467007. The cubic root of 71447920 is about 414.9507272028.

The spelling of 71447920 in words is "seventy-one million, four hundred forty-seven thousand, nine hundred twenty".