71611984 has 20 divisors (see below), whose sum is σ = 143224960. Its totient is φ = 34650720.

The previous prime is 71611961. The next prime is 71612011. The reversal of 71611984 is 48911617.

71611984 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71694 + ... + 72685.

It is an arithmetic number, because the mean of its divisors is an integer number (7161248).

Almost surely, 2^71611984 is an apocalyptic number.

It is an amenable number.

71611984 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

71611984 is a wasteful number, since it uses less digits than its factorization.

71611984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144418 (or 144412 counting only the distinct ones).

The product of its digits is 12096, while the sum is 37.

The square root of 71611984 is about 8462.3864246441. The cubic root of 71611984 is about 415.2680979232.

It can be divided in two parts, 716119 and 84, that multiplied together give a triangular number (60153996 = T₁₀₉₆₈).

The spelling of 71611984 in words is "seventy-one million, six hundred eleven thousand, nine hundred eighty-four".