71688816 has 30 divisors (see below), whose sum is σ = 200629520. Its totient is φ = 23896224.

The previous prime is 71688811. The next prime is 71688821. The reversal of 71688816 is 61888617.

It is an interprime number because it is at equal distance from previous prime (71688811) and next prime (71688821).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71688811) 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 5 ways as a sum of consecutive naturals, for example, 248776 + ... + 249063.

Almost surely, 2^71688816 is an apocalyptic number.

It is an amenable number.

71688816 is an abundant number, since it is smaller than the sum of its proper divisors (128940704).

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

71688816 is a wasteful number, since it uses less digits than its factorization.

71688816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497853 (or 497844 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 71688816 is about 8466.9248254605. The cubic root of 71688816 is about 415.4165575943.

The spelling of 71688816 in words is "seventy-one million, six hundred eighty-eight thousand, eight hundred sixteen".