71778568 has 16 divisors (see below), whose sum is σ = 135614160. Its totient is φ = 35614800.

The previous prime is 71778533. The next prime is 71778569. The reversal of 71778568 is 86587717.

It is not an unprimeable number, because it can be changed into a prime (71778569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33198 + ... + 35293.

It is an arithmetic number, because the mean of its divisors is an integer number (8475885).

Almost surely, 2^71778568 is an apocalyptic number.

It is an amenable number.

71778568 is a deficient number, since it is larger than the sum of its proper divisors (63835592).

71778568 is a wasteful number, since it uses less digits than its factorization.

71778568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68628 (or 68624 counting only the distinct ones).

The product of its digits is 658560, while the sum is 49.

The square root of 71778568 is about 8472.2233209471. The cubic root of 71778568 is about 415.5898478420.

The spelling of 71778568 in words is "seventy-one million, seven hundred seventy-eight thousand, five hundred sixty-eight".