71020613 has 12 divisors (see below), whose sum is σ = 75662028. Its totient is φ = 66648960.

The previous prime is 71020571. The next prime is 71020627. The reversal of 71020613 is 31602017.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 494209 + 70526404 = 703^2 + 8398^2 .

It is not a de Polignac number, because 71020613 - 2²⁰ = 69972037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71020633) 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, 39923 + ... + 41663.

It is an arithmetic number, because the mean of its divisors is an integer number (6305169).

Almost surely, 2^71020613 is an apocalyptic number.

It is an amenable number.

71020613 is a deficient number, since it is larger than the sum of its proper divisors (4641415).

71020613 is a wasteful number, since it uses less digits than its factorization.

71020613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892 (or 1873 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 71020613 is about 8427.3728409274. The cubic root of 71020613 is about 414.1218436829.

The spelling of 71020613 in words is "seventy-one million, twenty thousand, six hundred thirteen".