7271771728 has 40 divisors (see below), whose sum is σ = 15190868000. Its totient is φ = 3352212864.

The previous prime is 7271771723. The next prime is 7271771761. The reversal of 7271771728 is 8271771727.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7271771723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158323 + ... + 199021.

It is an arithmetic number, because the mean of its divisors is an integer number (379771700).

Almost surely, 2^7271771728 is an apocalyptic number.

It is an amenable number.

7271771728 is an abundant number, since it is smaller than the sum of its proper divisors (7919096272).

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

7271771728 is a wasteful number, since it uses less digits than its factorization.

7271771728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41579 (or 41573 counting only the distinct ones).

The product of its digits is 537824, while the sum is 49.

The square root of 7271771728 is about 85274.6839806516. The cubic root of 7271771728 is about 1937.3737560366.

Subtracting 7271771728 from its reverse (8271771727), we obtain a palindrome (999999999).

The spelling of 7271771728 in words is "seven billion, two hundred seventy-one million, seven hundred seventy-one thousand, seven hundred twenty-eight".