128869700 has 18 divisors (see below), whose sum is σ = 279647466. Its totient is φ = 51547840.

The previous prime is 128869687. The next prime is 128869703. The reversal of 128869700 is 7968821.

It can be written as a sum of positive squares in 3 ways, for example, as 1811716 + 127057984 = 1346^2 + 11272^2 .

It is a super-6 number, since 6×128869700⁶ (a number of 50 digits) contains 666666 as substring.

It is not an unprimeable number, because it can be changed into a prime (128869703) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 644249 + ... + 644448.

Almost surely, 2^128869700 is an apocalyptic number.

128869700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128869700 is an abundant number, since it is smaller than the sum of its proper divisors (150777766).

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

128869700 is a wasteful number, since it uses less digits than its factorization.

128869700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288711 (or 1288704 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 128869700 is about 11352.0791047279. The cubic root of 128869700 is about 505.1072542836.

The spelling of 128869700 in words is "one hundred twenty-eight million, eight hundred sixty-nine thousand, seven hundred".