71272240 has 40 divisors (see below), whose sum is σ = 178457328. Its totient is φ = 26315520.

The previous prime is 71272171. The next prime is 71272247. The reversal of 71272240 is 4227217.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (71272247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33226 + ... + 35305.

Almost surely, 2^71272240 is an apocalyptic number.

It is an amenable number.

71272240 is an abundant number, since it is smaller than the sum of its proper divisors (107185088).

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

71272240 is a wasteful number, since it uses less digits than its factorization.

71272240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68557 (or 68551 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 71272240 is about 8442.2887891851. The cubic root of 71272240 is about 414.6103469908.

Adding to 71272240 its reverse (4227217), we get a palindrome (75499457).

The spelling of 71272240 in words is "seventy-one million, two hundred seventy-two thousand, two hundred forty".