128678370975 has 72 divisors (see below), whose sum is σ = 287348310912. Its totient is φ = 53476718400.

The previous prime is 128678370949. The next prime is 128678371037. The reversal of 128678370975 is 579073876821.

128678370975 is a `hidden beast` number, since 128 + 6 + 78 + 370 + 9 + 75 = 666.

It is not a de Polignac number, because 128678370975 - 2¹³ = 128678362783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3696337 + ... + 3730986.

Almost surely, 2^128678370975 is an apocalyptic number.

128678370975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128678370975 is an abundant number, since it is smaller than the sum of its proper divisors (158669939937).

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

128678370975 is a wasteful number, since it uses less digits than its factorization.

128678370975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7427357 (or 7427349 counting only the distinct ones).

The product of its (nonzero) digits is 35562240, while the sum is 63.

The spelling of 128678370975 in words is "one hundred twenty-eight billion, six hundred seventy-eight million, three hundred seventy thousand, nine hundred seventy-five".