128355864 has 64 divisors (see below), whose sum is σ = 394947840. Its totient is φ = 33851520.

The previous prime is 128355863. The next prime is 128355881. The reversal of 128355864 is 468553821.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128355863) 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 in 15 ways as a sum of consecutive naturals, for example, 27202 + ... + 31569.

It is an arithmetic number, because the mean of its divisors is an integer number (6171060).

Almost surely, 2^128355864 is an apocalyptic number.

128355864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

128355864 is an abundant number, since it is smaller than the sum of its proper divisors (266591976).

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

128355864 is a wasteful number, since it uses less digits than its factorization.

128355864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58800 (or 58796 counting only the distinct ones).

The product of its digits is 230400, while the sum is 42.

The square root of 128355864 is about 11329.4246985449. The cubic root of 128355864 is about 504.4350300374.

The spelling of 128355864 in words is "one hundred twenty-eight million, three hundred fifty-five thousand, eight hundred sixty-four".