128708428680 has 1024 divisors, whose sum is σ = 507523968000. Its totient is φ = 28729147392.

The previous prime is 128708428661. The next prime is 128708428699. The reversal of 128708428680 is 86824807821.

128708428680 is a `hidden beast` number, since 1 + 287 + 0 + 8 + 4 + 286 + 80 = 666.

It is an interprime number because it is at equal distance from previous prime (128708428661) and next prime (128708428699).

It is a super-2 number, since 2×128708428680² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 1446162076 + ... + 1446162164.

It is an arithmetic number, because the mean of its divisors is an integer number (495628875).

Almost surely, 2^128708428680 is an apocalyptic number.

128708428680 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 128708428680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253761984000).

128708428680 is an abundant number, since it is smaller than the sum of its proper divisors (378815539320).

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

128708428680 is a wasteful number, since it uses less digits than its factorization.

128708428680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295 (or 285 counting only the distinct ones).

The product of its (nonzero) digits is 2752512, while the sum is 54.

The spelling of 128708428680 in words is "one hundred twenty-eight billion, seven hundred eight million, four hundred twenty-eight thousand, six hundred eighty".