206408408400 has 720 divisors, whose sum is σ = 752878152000. Its totient is φ = 52330291200.

The previous prime is 206408408399. The next prime is 206408408429. The reversal of 206408408400 is 4804804602.

206408408400 is a `hidden beast` number, since 2 + 0 + 640 + 8 + 4 + 0 + 8 + 4 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1153119511 + ... + 1153119689.

It is an arithmetic number, because the mean of its divisors is an integer number (1045664100).

Almost surely, 2^206408408400 is an apocalyptic number.

206408408400 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 206408408400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (376439076000).

206408408400 is an abundant number, since it is smaller than the sum of its proper divisors (546469743600).

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

206408408400 is a wasteful number, since it uses less digits than its factorization.

206408408400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 36.

The spelling of 206408408400 in words is "two hundred six billion, four hundred eight million, four hundred eight thousand, four hundred".