71712287 has 4 divisors (see below), whose sum is σ = 72087936. Its totient is φ = 71336640.

The previous prime is 71712259. The next prime is 71712293. The reversal of 71712287 is 78221717.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71712287 - 2¹² = 71708191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71712217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187538 + ... + 187919.

It is an arithmetic number, because the mean of its divisors is an integer number (18021984).

Almost surely, 2^71712287 is an apocalyptic number.

71712287 is a deficient number, since it is larger than the sum of its proper divisors (375649).

71712287 is a wasteful number, since it uses less digits than its factorization.

71712287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375648.

The product of its digits is 10976, while the sum is 35.

The square root of 71712287 is about 8468.3107524464. The cubic root of 71712287 is about 415.4618885989.

The spelling of 71712287 in words is "seventy-one million, seven hundred twelve thousand, two hundred eighty-seven".