7728881375 has 8 divisors (see below), whose sum is σ = 9645644112. Its totient is φ = 6183105000.

The previous prime is 7728881299. The next prime is 7728881393. The reversal of 7728881375 is 5731888277.

It is not a de Polignac number, because 7728881375 - 2¹⁸ = 7728619231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7728881375.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30915401 + ... + 30915650.

It is an arithmetic number, because the mean of its divisors is an integer number (1205705514).

Almost surely, 2^7728881375 is an apocalyptic number.

7728881375 is a deficient number, since it is larger than the sum of its proper divisors (1916762737).

7728881375 is an equidigital number, since it uses as much as digits as its factorization.

7728881375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61831066 (or 61831056 counting only the distinct ones).

The product of its digits is 5268480, while the sum is 56.

The square root of 7728881375 is about 87914.0567543098. The cubic root of 7728881375 is about 1977.1466378156.

The spelling of 7728881375 in words is "seven billion, seven hundred twenty-eight million, eight hundred eighty-one thousand, three hundred seventy-five".