71578013 has 4 divisors (see below), whose sum is σ = 77084028. Its totient is φ = 66072000.

The previous prime is 71577991. The next prime is 71578019. The reversal of 71578013 is 31087517.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7546009 + 64032004 = 2747^2 + 8002^2 .

It is a cyclic number.

It is not a de Polignac number, because 71578013 - 2¹² = 71573917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71578019) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2752988 + ... + 2753013.

It is an arithmetic number, because the mean of its divisors is an integer number (19271007).

Almost surely, 2^71578013 is an apocalyptic number.

It is an amenable number.

71578013 is a deficient number, since it is larger than the sum of its proper divisors (5506015).

71578013 is a wasteful number, since it uses less digits than its factorization.

71578013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5506014.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 71578013 is about 8460.3790104226. The cubic root of 71578013 is about 415.2024231435.

The spelling of 71578013 in words is "seventy-one million, five hundred seventy-eight thousand, thirteen".