71321472 has 96 divisors (see below), whose sum is σ = 212929080. Its totient is φ = 23763456.

The previous prime is 71321441. The next prime is 71321473. The reversal of 71321472 is 27412317.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71321473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29958 + ... + 32250.

Almost surely, 2^71321472 is an apocalyptic number.

71321472 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 71321472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106464540).

71321472 is an abundant number, since it is smaller than the sum of its proper divisors (141607608).

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

71321472 is an equidigital number, since it uses as much as digits as its factorization.

71321472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2322 (or 2298 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 71321472 is about 8445.2040827916. The cubic root of 71321472 is about 414.7057904082.

Adding to 71321472 its reverse (27412317), we get a palindrome (98733789).

The spelling of 71321472 in words is "seventy-one million, three hundred twenty-one thousand, four hundred seventy-two".