7271665 has 8 divisors (see below), whose sum is σ = 9239400. Its totient is φ = 5475072.

The previous prime is 7271651. The next prime is 7271669. The reversal of 7271665 is 5661727.

It can be written as a sum of positive squares in 4 ways, for example, as 126736 + 7144929 = 356^2 + 2673^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7271665 - 2¹⁵ = 7238897 is a prime.

It is a super-2 number, since 2×7271665² = 105754223744450, which contains 22 as substring.

7271665 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7271665.

It is not an unprimeable number, because it can be changed into a prime (7271669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42690 + ... + 42859.

It is an arithmetic number, because the mean of its divisors is an integer number (1154925).

Almost surely, 2^7271665 is an apocalyptic number.

It is an amenable number.

7271665 is a deficient number, since it is larger than the sum of its proper divisors (1967735).

7271665 is a wasteful number, since it uses less digits than its factorization.

7271665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85571.

The product of its digits is 17640, while the sum is 34.

The square root of 7271665 is about 2696.6024920258. The cubic root of 7271665 is about 193.7364277694.

The spelling of 7271665 in words is "seven million, two hundred seventy-one thousand, six hundred sixty-five".