209774462863680 has 1344 divisors, whose sum is σ = 886112475655680. Its totient is φ = 44821492531200.

The previous prime is 209774462863613. The next prime is 209774462863727. The reversal of 209774462863680 is 86368264477902.

It is a happy number.

209774462863680 is a `hidden beast` number, since 2 + 0 + 9 + 7 + 7 + 4 + 462 + 86 + 3 + 6 + 80 = 666.

209774462863680 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 209774462863599 and 209774462863608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 5389730620 + ... + 5389769540.

It is an arithmetic number, because the mean of its divisors is an integer number (659309877720).

Almost surely, 2^{209774462863680} is an apocalyptic number.

209774462863680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209774462863680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (443056237827840).

209774462863680 is an abundant number, since it is smaller than the sum of its proper divisors (676338012792000).

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

209774462863680 is a wasteful number, since it uses less digits than its factorization.

209774462863680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39560 (or 39547 counting only the distinct ones).

The product of its (nonzero) digits is 1170505728, while the sum is 72.

The spelling of 209774462863680 in words is "two hundred nine trillion, seven hundred seventy-four billion, four hundred sixty-two million, eight hundred sixty-three thousand, six hundred eighty".