71001320 has 32 divisors (see below), whose sum is σ = 172042920. Its totient is φ = 26215680.

The previous prime is 71001317. The next prime is 71001323. The reversal of 71001320 is 2310017.

It is an interprime number because it is at equal distance from previous prime (71001317) and next prime (71001323).

It can be written as a sum of positive squares in 4 ways, for example, as 25060036 + 45941284 = 5006^2 + 6778^2 .

It is a junction number, because it is equal to n+sod(n) for n = 71001295 and 71001304.

It is not an unprimeable number, because it can be changed into a prime (71001323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67751 + ... + 68790.

Almost surely, 2^71001320 is an apocalyptic number.

It is an amenable number.

71001320 is an abundant number, since it is smaller than the sum of its proper divisors (101041600).

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

71001320 is a wasteful number, since it uses less digits than its factorization.

71001320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136565 (or 136561 counting only the distinct ones).

The product of its (nonzero) digits is 42, while the sum is 14.

The square root of 71001320 is about 8426.2281004017. The cubic root of 71001320 is about 414.0843410670.

Adding to 71001320 its reverse (2310017), we get a palindrome (73311337).

The spelling of 71001320 in words is "seventy-one million, one thousand, three hundred twenty".