7728361887 has 4 divisors (see below), whose sum is σ = 10304482520. Its totient is φ = 5152241256.

The previous prime is 7728361847. The next prime is 7728361889. The reversal of 7728361887 is 7881638277.

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

It is not a de Polignac number, because 7728361887 - 2⁸ = 7728361631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7728361889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1288060312 + ... + 1288060317.

It is an arithmetic number, because the mean of its divisors is an integer number (2576120630).

Almost surely, 2^7728361887 is an apocalyptic number.

7728361887 is a deficient number, since it is larger than the sum of its proper divisors (2576120633).

7728361887 is a wasteful number, since it uses less digits than its factorization.

7728361887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576120632.

The product of its digits is 6322176, while the sum is 57.

The square root of 7728361887 is about 87911.1021828301. The cubic root of 7728361887 is about 1977.1023395998.

The spelling of 7728361887 in words is "seven billion, seven hundred twenty-eight million, three hundred sixty-one thousand, eight hundred eighty-seven".