71288279 has 4 divisors (see below), whose sum is σ = 71357160. Its totient is φ = 71219400.

The previous prime is 71288263. The next prime is 71288311. The reversal of 71288279 is 97288217.

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 71288279 - 2⁴ = 71288263 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 (71258279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32864 + ... + 34965.

It is an arithmetic number, because the mean of its divisors is an integer number (17839290).

Almost surely, 2^71288279 is an apocalyptic number.

71288279 is a deficient number, since it is larger than the sum of its proper divisors (68881).

71288279 is a wasteful number, since it uses less digits than its factorization.

71288279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68880.

The product of its digits is 112896, while the sum is 44.

The square root of 71288279 is about 8443.2386558713. The cubic root of 71288279 is about 414.6414457589.

The spelling of 71288279 in words is "seventy-one million, two hundred eighty-eight thousand, two hundred seventy-nine".