128920436898 has 16 divisors (see below), whose sum is σ = 281280953376. Its totient is φ = 39066799040.

The previous prime is 128920436891. The next prime is 128920436899. The reversal of 128920436898 is 898634029821.

It is not an unprimeable number, because it can be changed into a prime (128920436891) 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, 976669911 + ... + 976670042.

It is an arithmetic number, because the mean of its divisors is an integer number (17580059586).

Almost surely, 2^128920436898 is an apocalyptic number.

128920436898 is an abundant number, since it is smaller than the sum of its proper divisors (152360516478).

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

128920436898 is a wasteful number, since it uses less digits than its factorization.

128920436898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953339969.

The product of its (nonzero) digits is 11943936, while the sum is 60.

The spelling of 128920436898 in words is "one hundred twenty-eight billion, nine hundred twenty million, four hundred thirty-six thousand, eight hundred ninety-eight".