128612323898 has 16 divisors (see below), whose sum is σ = 198219018024. Its totient is φ = 62540835840.

The previous prime is 128612323843. The next prime is 128612323907. The reversal of 128612323898 is 898323216821.

It can be written as a sum of positive squares in 4 ways, for example, as 125949041449 + 2663282449 = 354893^2 + 51607^2 .

It is a super-2 number, since 2×128612323898² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208343 + ... + 548298.

Almost surely, 2^128612323898 is an apocalyptic number.

128612323898 is a deficient number, since it is larger than the sum of its proper divisors (69606694126).

128612323898 is a wasteful number, since it uses less digits than its factorization.

128612323898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758977.

The product of its digits is 1990656, while the sum is 53.

The spelling of 128612323898 in words is "one hundred twenty-eight billion, six hundred twelve million, three hundred twenty-three thousand, eight hundred ninety-eight".