7128387776 has 112 divisors (see below), whose sum is σ = 16027054560. Its totient is φ = 3125329920.

The previous prime is 7128387751. The next prime is 7128387781. The reversal of 7128387776 is 6777838217.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1258166 + ... + 1263818.

Almost surely, 2^7128387776 is an apocalyptic number.

7128387776 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7128387776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8013527280).

7128387776 is an abundant number, since it is smaller than the sum of its proper divisors (8898666784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7128387776 is a wasteful number, since it uses less digits than its factorization.

7128387776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5762 (or 5752 counting only the distinct ones).

The product of its digits is 5531904, while the sum is 56.

The square root of 7128387776 is about 84429.7801489498. The cubic root of 7128387776 is about 1924.5554964901. Note that the first 3 decimals are identical.

The spelling of 7128387776 in words is "seven billion, one hundred twenty-eight million, three hundred eighty-seven thousand, seven hundred seventy-six".