71289505 has 16 divisors (see below), whose sum is σ = 99615744. Its totient is φ = 47960640.

The previous prime is 71289503. The next prime is 71289509. The reversal of 71289505 is 50598217.

It is not a de Polignac number, because 71289505 - 2¹ = 71289503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71289503) 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, 17361 + ... + 21070.

It is an arithmetic number, because the mean of its divisors is an integer number (6225984).

Almost surely, 2^71289505 is an apocalyptic number.

It is an amenable number.

71289505 is a deficient number, since it is larger than the sum of its proper divisors (28326239).

71289505 is a wasteful number, since it uses less digits than its factorization.

71289505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38496.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 71289505 is about 8443.3112580314. The cubic root of 71289505 is about 414.6438227158.

The spelling of 71289505 in words is "seventy-one million, two hundred eighty-nine thousand, five hundred five".