128565620 has 12 divisors (see below), whose sum is σ = 269987844. Its totient is φ = 51426240.

The previous prime is 128565557. The next prime is 128565659. The reversal of 128565620 is 26565821.

It can be written as a sum of positive squares in 2 ways, for example, as 47637604 + 80928016 = 6902^2 + 8996^2 .

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, 3214121 + ... + 3214160.

It is an arithmetic number, because the mean of its divisors is an integer number (22498987).

Almost surely, 2^128565620 is an apocalyptic number.

128565620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128565620 is an abundant number, since it is smaller than the sum of its proper divisors (141422224).

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

128565620 is a wasteful number, since it uses less digits than its factorization.

128565620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6428290 (or 6428288 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 128565620 is about 11338.6780534593. The cubic root of 128565620 is about 504.7096589395.

The spelling of 128565620 in words is "one hundred twenty-eight million, five hundred sixty-five thousand, six hundred twenty".