128012998 has 4 divisors (see below), whose sum is σ = 192019500. Its totient is φ = 64006498.

The previous prime is 128012993. The next prime is 128012999. The reversal of 128012998 is 899210821.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 128012998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128012993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32003248 + ... + 32003251.

It is an arithmetic number, because the mean of its divisors is an integer number (48004875).

Almost surely, 2^128012998 is an apocalyptic number.

128012998 is a deficient number, since it is larger than the sum of its proper divisors (64006502).

128012998 is an equidigital number, since it uses as much as digits as its factorization.

128012998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64006501.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 128012998 is about 11314.2829202738. The cubic root of 128012998 is about 503.9854781866.

The spelling of 128012998 in words is "one hundred twenty-eight million, twelve thousand, nine hundred ninety-eight".