71797871 has 4 divisors (see below), whose sum is σ = 73738392. Its totient is φ = 69857352.

The previous prime is 71797849. The next prime is 71797877. The reversal of 71797871 is 17879717.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71797871 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 (71797877) 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, 970205 + ... + 970278.

It is an arithmetic number, because the mean of its divisors is an integer number (18434598).

Almost surely, 2^71797871 is an apocalyptic number.

71797871 is a deficient number, since it is larger than the sum of its proper divisors (1940521).

71797871 is a wasteful number, since it uses less digits than its factorization.

71797871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940520.

The product of its digits is 172872, while the sum is 47.

The square root of 71797871 is about 8473.3624376631. The cubic root of 71797871 is about 415.6270985704.

The spelling of 71797871 in words is "seventy-one million, seven hundred ninety-seven thousand, eight hundred seventy-one".