12728578770 has 48 divisors (see below), whose sum is σ = 33387201432. Its totient is φ = 3364247040.

The previous prime is 12728578769. The next prime is 12728578777. The reversal of 12728578770 is 7787582721.

It can be written as a sum of positive squares in 4 ways, for example, as 4579364241 + 8149214529 = 67671^2 + 90273^2 .

It is not an unprimeable number, because it can be changed into a prime (12728578777) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 615621 + ... + 635960.

Almost surely, 2^12728578770 is an apocalyptic number.

12728578770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12728578770 is an abundant number, since it is smaller than the sum of its proper divisors (20658622662).

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

12728578770 is a wasteful number, since it uses less digits than its factorization.

12728578770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251707 (or 1251704 counting only the distinct ones).

The product of its (nonzero) digits is 3073280, while the sum is 54.

The spelling of 12728578770 in words is "twelve billion, seven hundred twenty-eight million, five hundred seventy-eight thousand, seven hundred seventy".