204978836778780 has 24 divisors (see below), whose sum is σ = 573940742980752. Its totient is φ = 54661023140992.

The previous prime is 204978836778713. The next prime is 204978836778811. The reversal of 204978836778780 is 87877638879402.

It is a junction number, because it is equal to n+sod(n) for n = 204978836778693 and 204978836778702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1708156973097 + ... + 1708156973216.

It is an arithmetic number, because the mean of its divisors is an integer number (23914197624198).

Almost surely, 2^{204978836778780} is an apocalyptic number.

204978836778780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204978836778780 is an abundant number, since it is smaller than the sum of its proper divisors (368961906201972).

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

204978836778780 is a wasteful number, since it uses less digits than its factorization.

204978836778780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3416313946325 (or 3416313946323 counting only the distinct ones).

The product of its (nonzero) digits is 12745506816, while the sum is 84.

The spelling of 204978836778780 in words is "two hundred four trillion, nine hundred seventy-eight billion, eight hundred thirty-six million, seven hundred seventy-eight thousand, seven hundred eighty".