7172256728 has 64 divisors (see below), whose sum is σ = 16617726720. Its totient is φ = 2826000000.

The previous prime is 7172256703. The next prime is 7172256733. The reversal of 7172256728 is 8276522717.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163103 + ... + 202353.

It is an arithmetic number, because the mean of its divisors is an integer number (259651980).

Almost surely, 2^7172256728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7172256728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8308863360).

7172256728 is an abundant number, since it is smaller than the sum of its proper divisors (9445469992).

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

7172256728 is a wasteful number, since it uses less digits than its factorization.

7172256728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39528 (or 39524 counting only the distinct ones).

The product of its digits is 658560, while the sum is 47.

The square root of 7172256728 is about 84689.1771597764. The cubic root of 7172256728 is about 1928.4954069463.

The spelling of 7172256728 in words is "seven billion, one hundred seventy-two million, two hundred fifty-six thousand, seven hundred twenty-eight".