128700000000 has 972 divisors, whose sum is σ = 544933314744. Its totient is φ = 28800000000.

The previous prime is 128699999983. The next prime is 128700000017. The reversal of 128700000000 is 7821.

It is an interprime number because it is at equal distance from previous prime (128699999983) and next prime (128700000017).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 107 ways as a sum of consecutive naturals, for example, 9899999994 + ... + 9900000006.

Almost surely, 2^128700000000 is an apocalyptic number.

128700000000 is a gapful number since it is divisible by the number (10) 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 128700000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272466657372).

128700000000 is an abundant number, since it is smaller than the sum of its proper divisors (416233314744).

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

128700000000 is an frugal number, since it uses more digits than its factorization.

128700000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86 (or 34 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

Adding to 128700000000 its reverse (7821), we get a palindrome (128700007821).

The spelling of 128700000000 in words is "one hundred twenty-eight billion, seven hundred million", and thus it is an aban number.