128878631300 has 18 divisors (see below), whose sum is σ = 279666630138. Its totient is φ = 51551452480.

The previous prime is 128878631243. The next prime is 128878631347. The reversal of 128878631300 is 3136878821.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 44025271684 + 84853359616 = 209822^2 + 291296^2 .

It is a super-2 number, since 2×128878631300² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 644393057 + ... + 644393256.

Almost surely, 2^128878631300 is an apocalyptic number.

128878631300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128878631300 is an abundant number, since it is smaller than the sum of its proper divisors (150787998838).

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

128878631300 is a wasteful number, since it uses less digits than its factorization.

128878631300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288786327 (or 1288786320 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 128878631300 in words is "one hundred twenty-eight billion, eight hundred seventy-eight million, six hundred thirty-one thousand, three hundred".