128869936 has 30 divisors (see below), whose sum is σ = 270375180. Its totient is φ = 59477184.

The previous prime is 128869933. The next prime is 128869963. The reversal of 128869936 is 639968821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (128869933) 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, 21126 + ... + 26533.

It is an arithmetic number, because the mean of its divisors is an integer number (9012506).

Almost surely, 2^128869936 is an apocalyptic number.

128869936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128869936 is an abundant number, since it is smaller than the sum of its proper divisors (141505244).

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

128869936 is a wasteful number, since it uses less digits than its factorization.

128869936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47693 (or 47674 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 52.

The square root of 128869936 is about 11352.0894992948. The cubic root of 128869936 is about 505.1075626189.

It can be divided in two parts, 12886 and 9936, that added together give a palindrome (22822).

The spelling of 128869936 in words is "one hundred twenty-eight million, eight hundred sixty-nine thousand, nine hundred thirty-six".