128688753840 has 40 divisors (see below), whose sum is σ = 398935137648. Its totient is φ = 34317000960.

The previous prime is 128688753839. The next prime is 128688753841. The reversal of 128688753840 is 48357886821.

It is an interprime number because it is at equal distance from previous prime (128688753839) and next prime (128688753841).

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×128688753840² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (128688753841) 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, 268101331 + ... + 268101810.

Almost surely, 2^128688753840 is an apocalyptic number.

128688753840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128688753840 is an abundant number, since it is smaller than the sum of its proper divisors (270246383808).

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

128688753840 is a wasteful number, since it uses less digits than its factorization.

128688753840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536203157 (or 536203151 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 60.

The spelling of 128688753840 in words is "one hundred twenty-eight billion, six hundred eighty-eight million, seven hundred fifty-three thousand, eight hundred forty".