71373640 has 64 divisors (see below), whose sum is σ = 178945200. Its totient is φ = 25439232.

The previous prime is 71373587. The next prime is 71373697. The reversal of 71373640 is 4637317.

It can be written as a sum of positive squares in 8 ways, for example, as 8678916 + 62694724 = 2946^2 + 7918^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12714 + ... + 17446.

Almost surely, 2^71373640 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 71373640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89472600).

71373640 is an abundant number, since it is smaller than the sum of its proper divisors (107571560).

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

71373640 is a wasteful number, since it uses less digits than its factorization.

71373640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4786 (or 4782 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 31.

The square root of 71373640 is about 8448.2921351004. The cubic root of 71373640 is about 414.8068777731.

The spelling of 71373640 in words is "seventy-one million, three hundred seventy-three thousand, six hundred forty".