71981364 has 96 divisors (see below), whose sum is σ = 213937920. Its totient is φ = 18321408.

The previous prime is 71981353. The next prime is 71981407. The reversal of 71981364 is 46318917.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent 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, 30532 + ... + 32804.

It is an arithmetic number, because the mean of its divisors is an integer number (2228520).

Almost surely, 2^71981364 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 71981364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106968960).

71981364 is an abundant number, since it is smaller than the sum of its proper divisors (141956556).

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

71981364 is a wasteful number, since it uses less digits than its factorization.

71981364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2329 (or 2327 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 71981364 is about 8484.1831663396. The cubic root of 71981364 is about 415.9808685112.

The spelling of 71981364 in words is "seventy-one million, nine hundred eighty-one thousand, three hundred sixty-four".