68204861820 has 36 divisors (see below), whose sum is σ = 206888081400. Its totient is φ = 18187963104.

The previous prime is 68204861819. The next prime is 68204861839. The reversal of 68204861820 is 2816840286.

68204861820 is a `hidden beast` number, since 6 + 8 + 2 + 0 + 4 + 8 + 618 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189457770 + ... + 189458129.

It is an arithmetic number, because the mean of its divisors is an integer number (5746891150).

Almost surely, 2^68204861820 is an apocalyptic number.

68204861820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68204861820 is an abundant number, since it is smaller than the sum of its proper divisors (138683219580).

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

68204861820 is a wasteful number, since it uses less digits than its factorization.

68204861820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378915914 (or 378915909 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 45.

The spelling of 68204861820 in words is "sixty-eight billion, two hundred four million, eight hundred sixty-one thousand, eight hundred twenty".