71287239 has 16 divisors (see below), whose sum is σ = 100818432. Its totient is φ = 44650368.

The previous prime is 71287217. The next prime is 71287243. The reversal of 71287239 is 93278217.

It is not a de Polignac number, because 71287239 - 2⁵ = 71287207 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71287197 and 71287206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71287039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44242 + ... + 45824.

It is an arithmetic number, because the mean of its divisors is an integer number (6301152).

Almost surely, 2^71287239 is an apocalyptic number.

71287239 is a deficient number, since it is larger than the sum of its proper divisors (29531193).

71287239 is a wasteful number, since it uses less digits than its factorization.

71287239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486.

The product of its digits is 42336, while the sum is 39.

The square root of 71287239 is about 8443.1770679052. The cubic root of 71287239 is about 414.6394293956.

The spelling of 71287239 in words is "seventy-one million, two hundred eighty-seven thousand, two hundred thirty-nine".