71309056 has 72 divisors (see below), whose sum is σ = 175244384. Its totient is φ = 28200960.

The previous prime is 71309053. The next prime is 71309081. The reversal of 71309056 is 65090317.

It is a super-2 number, since 2×71309056² = 10169962935222272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71309053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21766 + ... + 24826.

Almost surely, 2^71309056 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 71309056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87622192).

71309056 is an abundant number, since it is smaller than the sum of its proper divisors (103935328).

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

71309056 is a wasteful number, since it uses less digits than its factorization.

71309056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3097 (or 3083 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 71309056 is about 8444.4689590287. The cubic root of 71309056 is about 414.6817243228.

The spelling of 71309056 in words is "seventy-one million, three hundred nine thousand, fifty-six".