128885870 has 16 divisors (see below), whose sum is σ = 232368048. Its totient is φ = 51471360.

The previous prime is 128885843. The next prime is 128885881. The reversal of 128885870 is 78588821.

It is a super-2 number, since 2×128885870² = 33223134971313800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3644 + ... + 16463.

It is an arithmetic number, because the mean of its divisors is an integer number (14523003).

Almost surely, 2^128885870 is an apocalyptic number.

128885870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128885870 is a deficient number, since it is larger than the sum of its proper divisors (103482178).

128885870 is a wasteful number, since it uses less digits than its factorization.

128885870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20755.

The product of its (nonzero) digits is 286720, while the sum is 47.

The square root of 128885870 is about 11352.7912867277. The cubic root of 128885870 is about 505.1283796081.

The spelling of 128885870 in words is "one hundred twenty-eight million, eight hundred eighty-five thousand, eight hundred seventy".