12700128 has 48 divisors (see below), whose sum is σ = 38102400. Its totient is φ = 3628416.

The previous prime is 12700123. The next prime is 12700141. The reversal of 12700128 is 82100721.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×12700128² = 322586502432768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12700123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8778 + ... + 10121.

It is an arithmetic number, because the mean of its divisors is an integer number (793800).

Almost surely, 2^12700128 is an apocalyptic number.

It is an amenable number.

12700128 is an abundant number, since it is smaller than the sum of its proper divisors (25402272).

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

12700128 is a wasteful number, since it uses less digits than its factorization.

12700128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18919 (or 18911 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 12700128 is about 3563.7238950289. The cubic root of 12700128 is about 233.3114392155.

Adding to 12700128 its reverse (82100721), we get a palindrome (94800849).

The spelling of 12700128 in words is "twelve million, seven hundred thousand, one hundred twenty-eight".