71997716 has 24 divisors (see below), whose sum is σ = 144312000. Its totient is φ = 30788352.

The previous prime is 71997713. The next prime is 71997719. The reversal of 71997716 is 61779917.

It is an interprime number because it is at equal distance from previous prime (71997713) and next prime (71997719).

It is a super-2 number, since 2×71997716² = 10367342218433312, which contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71997713) 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, 11396 + ... + 16548.

It is an arithmetic number, because the mean of its divisors is an integer number (6013000).

Almost surely, 2^71997716 is an apocalyptic number.

It is an amenable number.

71997716 is an abundant number, since it is smaller than the sum of its proper divisors (72314284).

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

71997716 is a wasteful number, since it uses less digits than its factorization.

71997716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5663 (or 5661 counting only the distinct ones).

The product of its digits is 166698, while the sum is 47.

The square root of 71997716 is about 8485.1467871805. The cubic root of 71997716 is about 416.0123655718.

The spelling of 71997716 in words is "seventy-one million, nine hundred ninety-seven thousand, seven hundred sixteen".