128305540678 has 12 divisors (see below), whose sum is σ = 223880076252. Its totient is φ = 54988088820.

The previous prime is 128305540663. The next prime is 128305540709. The reversal of 128305540678 is 876045503821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 654620008 + ... + 654620203.

It is an arithmetic number, because the mean of its divisors is an integer number (18656673021).

Almost surely, 2^128305540678 is an apocalyptic number.

128305540678 is a deficient number, since it is larger than the sum of its proper divisors (95574535574).

128305540678 is a wasteful number, since it uses less digits than its factorization.

128305540678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309240227 (or 1309240220 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 49.

The spelling of 128305540678 in words is "one hundred twenty-eight billion, three hundred five million, five hundred forty thousand, six hundred seventy-eight".