71387827 has 4 divisors (see below), whose sum is σ = 81586096. Its totient is φ = 61189560.

The previous prime is 71387779. The next prime is 71387851. The reversal of 71387827 is 72878317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72878317 = 1427 ⋅51071.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71387827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71387887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5099124 + ... + 5099137.

It is an arithmetic number, because the mean of its divisors is an integer number (20396524).

Almost surely, 2^71387827 is an apocalyptic number.

71387827 is a deficient number, since it is larger than the sum of its proper divisors (10198269).

71387827 is a wasteful number, since it uses less digits than its factorization.

71387827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10198268.

The product of its digits is 131712, while the sum is 43.

The square root of 71387827 is about 8449.1317305389. The cubic root of 71387827 is about 414.8343597927.

The spelling of 71387827 in words is "seventy-one million, three hundred eighty-seven thousand, eight hundred twenty-seven".