71671938 has 32 divisors (see below), whose sum is σ = 159355392. Its totient is φ = 21340800.

The previous prime is 71671921. The next prime is 71671981. The reversal of 71671938 is 83917617.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71671938.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12403 + ... + 17238.

It is an arithmetic number, because the mean of its divisors is an integer number (4979856).

Almost surely, 2^71671938 is an apocalyptic number.

71671938 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

71671938 is an abundant number, since it is smaller than the sum of its proper divisors (87683454).

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

71671938 is a wasteful number, since it uses less digits than its factorization.

71671938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29690.

The product of its digits is 63504, while the sum is 42.

The square root of 71671938 is about 8465.9280648964. The cubic root of 71671938 is about 415.3839539453.

The spelling of 71671938 in words is "seventy-one million, six hundred seventy-one thousand, nine hundred thirty-eight".