7128398776 has 16 divisors (see below), whose sum is σ = 13402983600. Its totient is φ = 3554269824.

The previous prime is 7128398749. The next prime is 7128398779. The reversal of 7128398776 is 6778938217.

It is a self number, because there is not a number n which added to its sum of digits gives 7128398776.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7128398779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1238145 + ... + 1243888.

It is an arithmetic number, because the mean of its divisors is an integer number (837686475).

Almost surely, 2^7128398776 is an apocalyptic number.

It is an amenable number.

7128398776 is a deficient number, since it is larger than the sum of its proper divisors (6274584824).

7128398776 is a wasteful number, since it uses less digits than its factorization.

7128398776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2482398 (or 2482394 counting only the distinct ones).

The product of its digits is 7112448, while the sum is 58.

The square root of 7128398776 is about 84429.8452918161. The cubic root of 7128398776 is about 1924.5564864335.

The spelling of 7128398776 in words is "seven billion, one hundred twenty-eight million, three hundred ninety-eight thousand, seven hundred seventy-six".