71856984 has 32 divisors (see below), whose sum is σ = 183467520. Its totient is φ = 23442336.

The previous prime is 71856979. The next prime is 71856989. The reversal of 71856984 is 48965817.

It is an interprime number because it is at equal distance from previous prime (71856979) and next prime (71856989).

It is a super-2 number, since 2×71856984² = 10326852299152512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71856989) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 30724 + ... + 32979.

It is an arithmetic number, because the mean of its divisors is an integer number (5733360).

Almost surely, 2^71856984 is an apocalyptic number.

It is an amenable number.

71856984 is an abundant number, since it is smaller than the sum of its proper divisors (111610536).

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

71856984 is a wasteful number, since it uses less digits than its factorization.

71856984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63759 (or 63755 counting only the distinct ones).

The product of its digits is 483840, while the sum is 48.

The square root of 71856984 is about 8476.8498866029. The cubic root of 71856984 is about 415.7411327085.

The spelling of 71856984 in words is "seventy-one million, eight hundred fifty-six thousand, nine hundred eighty-four".