71531168 has 24 divisors (see below), whose sum is σ = 145684980. Its totient is φ = 34531840.

The previous prime is 71531149. The next prime is 71531177. The reversal of 71531168 is 86113517.

It can be written as a sum of positive squares in 2 ways, for example, as 71436304 + 94864 = 8452^2 + 308^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

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 3 ways as a sum of consecutive naturals, for example, 37613 + ... + 39468.

Almost surely, 2^71531168 is an apocalyptic number.

It is an amenable number.

71531168 is an abundant number, since it is smaller than the sum of its proper divisors (74153812).

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

71531168 is a wasteful number, since it uses less digits than its factorization.

71531168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77120 (or 77112 counting only the distinct ones).

The product of its digits is 5040, while the sum is 32.

The square root of 71531168 is about 8457.6100643149. The cubic root of 71531168 is about 415.1118254801. Note that the first 3 decimals are identical.

The spelling of 71531168 in words is "seventy-one million, five hundred thirty-one thousand, one hundred sixty-eight".