2028820851688 has 8 divisors (see below), whose sum is σ = 3804039096930. Its totient is φ = 1014410425840.

The previous prime is 2028820851679. The next prime is 2028820851689. The reversal of 2028820851688 is 8861580288202.

It can be written as a sum of positive squares in only one way, i.e., 1509905203524 + 518915648164 = 1228782^2 + 720358^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×2028820851688² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2028820851689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126801303223 + ... + 126801303238.

Almost surely, 2^{2028820851688} is an apocalyptic number.

It is an amenable number.

2028820851688 is a deficient number, since it is larger than the sum of its proper divisors (1775218245242).

2028820851688 is a wasteful number, since it uses less digits than its factorization.

2028820851688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253602606467 (or 253602606463 counting only the distinct ones).

The product of its (nonzero) digits is 7864320, while the sum is 58.

The spelling of 2028820851688 in words is "two trillion, twenty-eight billion, eight hundred twenty million, eight hundred fifty-one thousand, six hundred eighty-eight".