128866926578478 has 32 divisors (see below), whose sum is σ = 281401073205120. Its totient is φ = 39017685233760.

The previous prime is 128866926578477. The next prime is 128866926578483. The reversal of 128866926578478 is 874875629668821.

128866926578478 is digitally balanced in base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 128866926578394 and 128866926578403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128866926578473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 822385513 + ... + 822542196.

It is an arithmetic number, because the mean of its divisors is an integer number (8793783537660).

Almost surely, 2^{128866926578478} is an apocalyptic number.

128866926578478 is an abundant number, since it is smaller than the sum of its proper divisors (152534146626642).

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

128866926578478 is a wasteful number, since it uses less digits than its factorization.

128866926578478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644928912.

The product of its digits is 31213486080, while the sum is 87.

The spelling of 128866926578478 in words is "one hundred twenty-eight trillion, eight hundred sixty-six billion, nine hundred twenty-six million, five hundred seventy-eight thousand, four hundred seventy-eight".