128309394078 has 24 divisors (see below), whose sum is σ = 278013767616. Its totient is φ = 42768247200.

The previous prime is 128309394053. The next prime is 128309394091. The reversal of 128309394078 is 870493903821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 451498 + ... + 678578.

It is an arithmetic number, because the mean of its divisors is an integer number (11583906984).

Almost surely, 2^128309394078 is an apocalyptic number.

128309394078 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

128309394078 is an abundant number, since it is smaller than the sum of its proper divisors (149704373538).

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

128309394078 is a wasteful number, since it uses less digits than its factorization.

128309394078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258480 (or 258477 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 128309394078 in words is "one hundred twenty-eight billion, three hundred nine million, three hundred ninety-four thousand, seventy-eight".