128367820 has 24 divisors (see below), whose sum is σ = 308083104. Its totient is φ = 44011776.

The previous prime is 128367803. The next prime is 128367823. The reversal of 128367820 is 28763821.

It is a self number, because there is not a number n which added to its sum of digits gives 128367820.

It is not an unprimeable number, because it can be changed into a prime (128367823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 458317 + ... + 458596.

It is an arithmetic number, because the mean of its divisors is an integer number (12836796).

Almost surely, 2^128367820 is an apocalyptic number.

128367820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128367820 is an abundant number, since it is smaller than the sum of its proper divisors (179715284).

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

128367820 is a wasteful number, since it uses less digits than its factorization.

128367820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916929 (or 916927 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 128367820 is about 11329.9523388230. The cubic root of 128367820 is about 504.4506918020.

The spelling of 128367820 in words is "one hundred twenty-eight million, three hundred sixty-seven thousand, eight hundred twenty".