71643018 has 8 divisors (see below), whose sum is σ = 143286048. Its totient is φ = 23881004.

The previous prime is 71643001. The next prime is 71643029. The reversal of 71643018 is 81034617.

It is a happy number.

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

71643018 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5970246 + ... + 5970257.

It is an arithmetic number, because the mean of its divisors is an integer number (17910756).

Almost surely, 2^71643018 is an apocalyptic number.

71643018 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71643018 is a wasteful number, since it uses less digits than its factorization.

71643018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11940508.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 71643018 is about 8464.2198695450. The cubic root of 71643018 is about 415.3280765666.

It can be divided in two parts, 716 and 43018, that added together give a palindrome (43734).

The spelling of 71643018 in words is "seventy-one million, six hundred forty-three thousand, eighteen".