71336640 has 112 divisors (see below), whose sum is σ = 238475520. Its totient is φ = 18017280.

The previous prime is 71336609. The next prime is 71336651. The reversal of 71336640 is 4663317.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 71336598 and 71336607.

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, 16285 + ... + 20195.

Almost surely, 2^71336640 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 71336640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119237760).

71336640 is an abundant number, since it is smaller than the sum of its proper divisors (167138880).

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

71336640 is a wasteful number, since it uses less digits than its factorization.

71336640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3950 (or 3940 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 71336640 is about 8446.1020595302. The cubic root of 71336640 is about 414.7351869391.

Adding to 71336640 its reverse (4663317), we get a palindrome (75999957).

The spelling of 71336640 in words is "seventy-one million, three hundred thirty-six thousand, six hundred forty".