128019898 has 4 divisors (see below), whose sum is σ = 192029850. Its totient is φ = 64009948.

The previous prime is 128019883. The next prime is 128019919. The reversal of 128019898 is 898910821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 116575209 + 11444689 = 10797^2 + 3383^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32004973 + ... + 32004976.

Almost surely, 2^128019898 is an apocalyptic number.

128019898 is a deficient number, since it is larger than the sum of its proper divisors (64009952).

128019898 is an equidigital number, since it uses as much as digits as its factorization.

128019898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64009951.

The product of its (nonzero) digits is 82944, while the sum is 46.

The square root of 128019898 is about 11314.5878404827. The cubic root of 128019898 is about 503.9945330935.

The spelling of 128019898 in words is "one hundred twenty-eight million, nineteen thousand, eight hundred ninety-eight".