71861813 has 8 divisors (see below), whose sum is σ = 74570496. Its totient is φ = 69177600.

The previous prime is 71861791. The next prime is 71861827. The reversal of 71861813 is 31816817.

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 71861813 - 2¹⁴ = 71845429 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 (71860813) 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, 23 + ... + 11988.

It is an arithmetic number, because the mean of its divisors is an integer number (9321312).

Almost surely, 2^71861813 is an apocalyptic number.

It is an amenable number.

71861813 is a deficient number, since it is larger than the sum of its proper divisors (2708683).

71861813 is a wasteful number, since it uses less digits than its factorization.

71861813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12235.

The product of its digits is 8064, while the sum is 35.

The square root of 71861813 is about 8477.1347164003. The cubic root of 71861813 is about 415.7504455076.

The spelling of 71861813 in words is "seventy-one million, eight hundred sixty-one thousand, eight hundred thirteen".