71670881 has 4 divisors (see below), whose sum is σ = 71696064. Its totient is φ = 71645700.

The previous prime is 71670877. The next prime is 71670917. The reversal of 71670881 is 18807617.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71670881 - 2² = 71670877 is a prime.

It is a super-2 number, since 2×71670881² = 10273430366632322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71670811) 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, 7685 + ... + 14226.

It is an arithmetic number, because the mean of its divisors is an integer number (17924016).

Almost surely, 2^71670881 is an apocalyptic number.

It is an amenable number.

71670881 is a deficient number, since it is larger than the sum of its proper divisors (25183).

71670881 is a wasteful number, since it uses less digits than its factorization.

71670881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25182.

The product of its (nonzero) digits is 18816, while the sum is 38.

The square root of 71670881 is about 8465.8656379605. The cubic root of 71670881 is about 415.3819119421.

The spelling of 71670881 in words is "seventy-one million, six hundred seventy thousand, eight hundred eighty-one".