71643648 has 40 divisors (see below), whose sum is σ = 190867248. Its totient is φ = 23880704.

The previous prime is 71643647. The next prime is 71643667. The reversal of 71643648 is 84634617.

It is not an unprimeable number, because it can be changed into a prime (71643647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21786 + ... + 24857.

Almost surely, 2^71643648 is an apocalyptic number.

It is an amenable number.

71643648 is an abundant number, since it is smaller than the sum of its proper divisors (119223600).

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

71643648 is an equidigital number, since it uses as much as digits as its factorization.

71643648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46664 (or 46648 counting only the distinct ones).

The product of its digits is 96768, while the sum is 39.

The square root of 71643648 is about 8464.2570849425. The cubic root of 71643648 is about 415.3292939726.

The spelling of 71643648 in words is "seventy-one million, six hundred forty-three thousand, six hundred forty-eight".