128420998 has 8 divisors (see below), whose sum is σ = 193090320. Its totient is φ = 64057560.

The previous prime is 128420989. The next prime is 128421001. The reversal of 128420998 is 899024821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75418 + ... + 77101.

It is an arithmetic number, because the mean of its divisors is an integer number (24136290).

Almost surely, 2^128420998 is an apocalyptic number.

128420998 is a deficient number, since it is larger than the sum of its proper divisors (64669322).

128420998 is a wasteful number, since it uses less digits than its factorization.

128420998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152942.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 128420998 is about 11332.2988841629. The cubic root of 128420998 is about 504.5203405542.

The spelling of 128420998 in words is "one hundred twenty-eight million, four hundred twenty thousand, nine hundred ninety-eight".