7728399227 has 4 divisors (see below), whose sum is σ = 7735753656. Its totient is φ = 7721044800.

The previous prime is 7728399179. The next prime is 7728399229. The reversal of 7728399227 is 7229938277.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7728399227 - 2⁶ = 7728399163 is a prime.

It is a super-2 number, since 2×7728399227² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7728399229) 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 3 ways as a sum of consecutive naturals, for example, 3675638 + ... + 3677739.

It is an arithmetic number, because the mean of its divisors is an integer number (1933938414).

Almost surely, 2^7728399227 is an apocalyptic number.

7728399227 is a deficient number, since it is larger than the sum of its proper divisors (7354429).

7728399227 is a wasteful number, since it uses less digits than its factorization.

7728399227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7354428.

The product of its digits is 5334336, while the sum is 56.

The square root of 7728399227 is about 87911.3145562049. The cubic root of 7728399227 is about 1977.1055237538.

The spelling of 7728399227 in words is "seven billion, seven hundred twenty-eight million, three hundred ninety-nine thousand, two hundred twenty-seven".