7728939189 has 32 divisors (see below), whose sum is σ = 11840532480. Its totient is φ = 4977601200.

The previous prime is 7728939131. The next prime is 7728939199. The reversal of 7728939189 is 9819398277.

It is not a de Polignac number, because 7728939189 - 2¹⁵ = 7728906421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7728939199) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 483454 + ... + 499184.

It is an arithmetic number, because the mean of its divisors is an integer number (370016640).

Almost surely, 2^7728939189 is an apocalyptic number.

It is an amenable number.

7728939189 is a deficient number, since it is larger than the sum of its proper divisors (4111593291).

7728939189 is a wasteful number, since it uses less digits than its factorization.

7728939189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16358 (or 16352 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 63.

The square root of 7728939189 is about 87914.3855634560. The cubic root of 7728939189 is about 1977.1515676567.

The spelling of 7728939189 in words is "seven billion, seven hundred twenty-eight million, nine hundred thirty-nine thousand, one hundred eighty-nine".