71518640 has 60 divisors (see below), whose sum is σ = 172374384. Its totient is φ = 27595008.

The previous prime is 71518627. The next prime is 71518673. The reversal of 71518640 is 4681517.

It is a happy number.

It is a super-2 number, since 2×71518640² = 10229831734899200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71518597 and 71518606.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66749 + ... + 67811.

Almost surely, 2^71518640 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 71518640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86187192).

71518640 is an abundant number, since it is smaller than the sum of its proper divisors (100855744).

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

71518640 is a wasteful number, since it uses less digits than its factorization.

71518640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134 (or 1099 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 71518640 is about 8456.8693971233. The cubic root of 71518640 is about 415.0875897764.

The spelling of 71518640 in words is "seventy-one million, five hundred eighteen thousand, six hundred forty".