12728645700 has 72 divisors (see below), whose sum is σ = 37346984640. Its totient is φ = 3346492800.

The previous prime is 12728645689. The next prime is 12728645701. The reversal of 12728645700 is 754682721.

It is a super-2 number, since 2×12728645700² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12728645701) 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 23 ways as a sum of consecutive naturals, for example, 277495 + ... + 320094.

It is an arithmetic number, because the mean of its divisors is an integer number (518708120).

Almost surely, 2^12728645700 is an apocalyptic number.

12728645700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12728645700 is an abundant number, since it is smaller than the sum of its proper divisors (24618338940).

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

12728645700 is a wasteful number, since it uses less digits than its factorization.

12728645700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597677 (or 597670 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 42.

The spelling of 12728645700 in words is "twelve billion, seven hundred twenty-eight million, six hundred forty-five thousand, seven hundred".