71571072 has 64 divisors (see below), whose sum is σ = 196696800. Its totient is φ = 23030784.

The previous prime is 71571047. The next prime is 71571091. The reversal of 71571072 is 27017517.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7923 + ... + 14349.

Almost surely, 2^71571072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71571072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98348400).

71571072 is an abundant number, since it is smaller than the sum of its proper divisors (125125728).

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

71571072 is a wasteful number, since it uses less digits than its factorization.

71571072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6473 (or 6461 counting only the distinct ones).

The product of its (nonzero) digits is 3430, while the sum is 30.

The square root of 71571072 is about 8459.9687942687. The cubic root of 71571072 is about 415.1890018285.

Adding to 71571072 its reverse (27017517), we get a palindrome (98588589).

The spelling of 71571072 in words is "seventy-one million, five hundred seventy-one thousand, seventy-two".