71384813 has 8 divisors (see below), whose sum is σ = 73313016. Its totient is φ = 69465600.

The previous prime is 71384783. The next prime is 71384861. The reversal of 71384813 is 31848317.

It can be written as a sum of positive squares in 4 ways, for example, as 9872164 + 61512649 = 3142^2 + 7843^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71384813 - 2¹² = 71380717 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 (71384713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15743 + ... + 19763.

It is an arithmetic number, because the mean of its divisors is an integer number (9164127).

Almost surely, 2^71384813 is an apocalyptic number.

It is an amenable number.

71384813 is a deficient number, since it is larger than the sum of its proper divisors (1928203).

71384813 is a wasteful number, since it uses less digits than its factorization.

71384813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4495.

The product of its digits is 16128, while the sum is 35.

The square root of 71384813 is about 8448.9533671337. The cubic root of 71384813 is about 414.8285215968.

The spelling of 71384813 in words is "seventy-one million, three hundred eighty-four thousand, eight hundred thirteen".