71947656 has 128 divisors (see below), whose sum is σ = 220838400. Its totient is φ = 21522240.

The previous prime is 71947649. The next prime is 71947669. The reversal of 71947656 is 65674917.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 254091 + ... + 254373.

It is an arithmetic number, because the mean of its divisors is an integer number (1725300).

Almost surely, 2^71947656 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 71947656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110419200).

71947656 is an abundant number, since it is smaller than the sum of its proper divisors (148890744).

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

71947656 is a wasteful number, since it uses less digits than its factorization.

71947656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 406 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 71947656 is about 8482.1964136655. The cubic root of 71947656 is about 415.9159254404.

The spelling of 71947656 in words is "seventy-one million, nine hundred forty-seven thousand, six hundred fifty-six".