71272520 has 32 divisors (see below), whose sum is σ = 174942720. Its totient is φ = 25917120.

The previous prime is 71272519. The next prime is 71272547. The reversal of 71272520 is 2527217.

It is a self number, because there is not a number n which added to its sum of digits gives 71272520.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 80552 + ... + 81431.

It is an arithmetic number, because the mean of its divisors is an integer number (5466960).

Almost surely, 2^71272520 is an apocalyptic number.

It is an amenable number.

71272520 is an abundant number, since it is smaller than the sum of its proper divisors (103670200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71272520 is a wasteful number, since it uses less digits than its factorization.

71272520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162005 (or 162001 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 71272520 is about 8442.3053723494. The cubic root of 71272520 is about 414.6108899359.

Adding to 71272520 its reverse (2527217), we get a palindrome (73799737).

The spelling of 71272520 in words is "seventy-one million, two hundred seventy-two thousand, five hundred twenty".