71881879 has 4 divisors (see below), whose sum is σ = 72182880. Its totient is φ = 71580880.

The previous prime is 71881867. The next prime is 71881907. The reversal of 71881879 is 97818817.

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

It is a cyclic number.

It is not a de Polignac number, because 71881879 - 2⁷ = 71881751 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 (71881819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150142 + ... + 150619.

It is an arithmetic number, because the mean of its divisors is an integer number (18045720).

Almost surely, 2^71881879 is an apocalyptic number.

71881879 is a deficient number, since it is larger than the sum of its proper divisors (301001).

71881879 is a wasteful number, since it uses less digits than its factorization.

71881879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301000.

The product of its digits is 225792, while the sum is 49.

The square root of 71881879 is about 8478.3181704864. The cubic root of 71881879 is about 415.7891386221.

The spelling of 71881879 in words is "seventy-one million, eight hundred eighty-one thousand, eight hundred seventy-nine".