71984436 has 12 divisors (see below), whose sum is σ = 167963712. Its totient is φ = 23994808.

The previous prime is 71984431. The next prime is 71984491. The reversal of 71984436 is 63448917.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71984431) 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 3 ways as a sum of consecutive naturals, for example, 2999340 + ... + 2999363.

It is an arithmetic number, because the mean of its divisors is an integer number (13996976).

Almost surely, 2^71984436 is an apocalyptic number.

It is an amenable number.

71984436 is an abundant number, since it is smaller than the sum of its proper divisors (95979276).

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

71984436 is a wasteful number, since it uses less digits than its factorization.

71984436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5998710 (or 5998708 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 71984436 is about 8484.3642071755. The cubic root of 71984436 is about 415.9867861311.

The spelling of 71984436 in words is "seventy-one million, nine hundred eighty-four thousand, four hundred thirty-six".