128628580 has 12 divisors (see below), whose sum is σ = 270120060. Its totient is φ = 51451424.

The previous prime is 128628553. The next prime is 128628583. The reversal of 128628580 is 85826821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 39212644 + 89415936 = 6262^2 + 9456^2 .

It is not an unprimeable number, because it can be changed into a prime (128628583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3215695 + ... + 3215734.

It is an arithmetic number, because the mean of its divisors is an integer number (22510005).

Almost surely, 2^128628580 is an apocalyptic number.

128628580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128628580 is an abundant number, since it is smaller than the sum of its proper divisors (141491480).

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

128628580 is a wasteful number, since it uses less digits than its factorization.

128628580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6431438 (or 6431436 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 128628580 is about 11341.4540513992. The cubic root of 128628580 is about 504.7920327872.

The spelling of 128628580 in words is "one hundred twenty-eight million, six hundred twenty-eight thousand, five hundred eighty".