128428340 has 12 divisors (see below), whose sum is σ = 269699556. Its totient is φ = 51371328.

The previous prime is 128428337. The next prime is 128428351. The reversal of 128428340 is 43824821.

It can be written as a sum of positive squares in 2 ways, for example, as 51093904 + 77334436 = 7148^2 + 8794^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 128428297 and 128428306.

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, 3210689 + ... + 3210728.

It is an arithmetic number, because the mean of its divisors is an integer number (22474963).

Almost surely, 2^128428340 is an apocalyptic number.

128428340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128428340 is an abundant number, since it is smaller than the sum of its proper divisors (141271216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128428340 is a wasteful number, since it uses less digits than its factorization.

128428340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6421426 (or 6421424 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 128428340 is about 11332.6228208654. The cubic root of 128428340 is about 504.5299550716.

The spelling of 128428340 in words is "one hundred twenty-eight million, four hundred twenty-eight thousand, three hundred forty".