128420828 has 6 divisors (see below), whose sum is σ = 224736456. Its totient is φ = 64210412.

The previous prime is 128420813. The next prime is 128420861. The reversal of 128420828 is 828024821.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16052600 + ... + 16052607.

It is an arithmetic number, because the mean of its divisors is an integer number (37456076).

Almost surely, 2^128420828 is an apocalyptic number.

It is an amenable number.

128420828 is a deficient number, since it is larger than the sum of its proper divisors (96315628).

128420828 is a wasteful number, since it uses less digits than its factorization.

128420828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32105211 (or 32105209 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 35.

The square root of 128420828 is about 11332.2913834758. The cubic root of 128420828 is about 504.5201179309.

The spelling of 128420828 in words is "one hundred twenty-eight million, four hundred twenty thousand, eight hundred twenty-eight".