840128608 has 48 divisors (see below), whose sum is σ = 1866609360. Its totient is φ = 368704000.

The previous prime is 840128591. The next prime is 840128617. The reversal of 840128608 is 806821048.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30943 + ... + 51358.

It is an arithmetic number, because the mean of its divisors is an integer number (38887695).

Almost surely, 2^840128608 is an apocalyptic number.

840128608 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

840128608 is an abundant number, since it is smaller than the sum of its proper divisors (1026480752).

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

840128608 is a wasteful number, since it uses less digits than its factorization.

840128608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82351 (or 82343 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 840128608 is about 28984.9721062484. The cubic root of 840128608 is about 943.5869470336.

The spelling of 840128608 in words is "eight hundred forty million, one hundred twenty-eight thousand, six hundred eight".