71808912 has 90 divisors (see below), whose sum is σ = 233798838. Its totient is φ = 20514816.

The previous prime is 71808907. The next prime is 71808937. The reversal of 71808912 is 21980817.

It can be written as a sum of positive squares in only one way, i.e., 65028096 + 6780816 = 8064^2 + 2604^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1968 + ... + 12144.

Almost surely, 2^71808912 is an apocalyptic number.

71808912 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71808912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116899419).

71808912 is an abundant number, since it is smaller than the sum of its proper divisors (161989926).

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

71808912 is a wasteful number, since it uses less digits than its factorization.

71808912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10205 (or 10189 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 71808912 is about 8474.0139249355. The cubic root of 71808912 is about 415.6484023757.

The spelling of 71808912 in words is "seventy-one million, eight hundred eight thousand, nine hundred twelve".