71027720 has 32 divisors (see below), whose sum is σ = 160519320. Its totient is φ = 28285440.

The previous prime is 71027713. The next prime is 71027731. The reversal of 71027720 is 2772017.

It can be written as a sum of positive squares in 4 ways, for example, as 60124516 + 10903204 = 7754^2 + 3302^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 71027720.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5510 + ... + 13130.

Almost surely, 2^71027720 is an apocalyptic number.

It is an amenable number.

71027720 is an abundant number, since it is smaller than the sum of its proper divisors (89491600).

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

71027720 is a wasteful number, since it uses less digits than its factorization.

71027720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7865 (or 7861 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 26.

The square root of 71027720 is about 8427.7944920365. The cubic root of 71027720 is about 414.1356568828.

Adding to 71027720 its reverse (2772017), we get a palindrome (73799737).

The spelling of 71027720 in words is "seventy-one million, twenty-seven thousand, seven hundred twenty".