128628258 has 32 divisors (see below), whose sum is σ = 281489472. Its totient is φ = 38860800.

The previous prime is 128628221. The next prime is 128628281. The reversal of 128628258 is 852826821.

It is a super-2 number, since 2×128628258² = 33090457512229128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20538 + ... + 26058.

It is an arithmetic number, because the mean of its divisors is an integer number (8796546).

Almost surely, 2^128628258 is an apocalyptic number.

128628258 is an abundant number, since it is smaller than the sum of its proper divisors (152861214).

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

128628258 is a wasteful number, since it uses less digits than its factorization.

128628258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5890.

The product of its digits is 122880, while the sum is 42.

The square root of 128628258 is about 11341.4398556797. The cubic root of 128628258 is about 504.7916115663.

The spelling of 128628258 in words is "one hundred twenty-eight million, six hundred twenty-eight thousand, two hundred fifty-eight".