71399680 has 108 divisors (see below), whose sum is σ = 188393436. Its totient is φ = 25907200.

The previous prime is 71399641. The next prime is 71399683. The reversal of 71399680 is 8699317.

It can be written as a sum of positive squares in 2 ways, for example, as 24285184 + 47114496 = 4928^2 + 6864^2 .

It is not an unprimeable number, because it can be changed into a prime (71399683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154650 + ... + 155110.

Almost surely, 2^71399680 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 71399680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94196718).

71399680 is an abundant number, since it is smaller than the sum of its proper divisors (116993756).

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

71399680 is a wasteful number, since it uses less digits than its factorization.

71399680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504 (or 479 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 71399680 is about 8449.8331344471. The cubic root of 71399680 is about 414.8573177663.

The spelling of 71399680 in words is "seventy-one million, three hundred ninety-nine thousand, six hundred eighty".