71971836 has 24 divisors (see below), whose sum is σ = 168661584. Its totient is φ = 23886720.

The previous prime is 71971831. The next prime is 71971841. The reversal of 71971836 is 63817917.

It is an interprime number because it is at equal distance from previous prime (71971831) and next prime (71971841).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71971831) 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, 10075 + ... + 15666.

It is an arithmetic number, because the mean of its divisors is an integer number (7027566).

Almost surely, 2^71971836 is an apocalyptic number.

It is an amenable number.

71971836 is an abundant number, since it is smaller than the sum of its proper divisors (96689748).

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

71971836 is a wasteful number, since it uses less digits than its factorization.

71971836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25981 (or 25979 counting only the distinct ones).

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

The square root of 71971836 is about 8483.6216322983. The cubic root of 71971836 is about 415.9625135723.

The spelling of 71971836 in words is "seventy-one million, nine hundred seventy-one thousand, eight hundred thirty-six".