71027640 has 48 divisors (see below), whose sum is σ = 230841000. Its totient is φ = 18940608.

The previous prime is 71027639. The next prime is 71027647. The reversal of 71027640 is 4672017.

71027640 is a `hidden beast` number, since 7 + 10 + 2 + 7 + 640 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71027647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98290 + ... + 99009.

Almost surely, 2^71027640 is an apocalyptic number.

It is an amenable number.

71027640 is an abundant number, since it is smaller than the sum of its proper divisors (159813360).

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

71027640 is a wasteful number, since it uses less digits than its factorization.

71027640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197316 (or 197309 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 71027640 is about 8427.7897458349. The cubic root of 71027640 is about 414.1355013995.

Adding to 71027640 its reverse (4672017), we get a palindrome (75699657).

The spelling of 71027640 in words is "seventy-one million, twenty-seven thousand, six hundred forty".