100128020680 has 16 divisors (see below), whose sum is σ = 225288046620. Its totient is φ = 40051208256.

The previous prime is 100128020647. The next prime is 100128020689. The reversal of 100128020680 is 86020821001.

It can be written as a sum of positive squares in 2 ways, for example, as 100049485636 + 78535044 = 316306^2 + 8862^2 .

It is not an unprimeable number, because it can be changed into a prime (100128020689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1251600219 + ... + 1251600298.

Almost surely, 2^100128020680 is an apocalyptic number.

100128020680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100128020680 is an abundant number, since it is smaller than the sum of its proper divisors (125160025940).

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

100128020680 is a wasteful number, since it uses less digits than its factorization.

100128020680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2503200528 (or 2503200524 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

Adding to 100128020680 its reverse (86020821001), we get a palindrome (186148841681).

The spelling of 100128020680 in words is "one hundred billion, one hundred twenty-eight million, twenty thousand, six hundred eighty".