208639998029376 has 63 divisors (see below), whose sum is σ = 598029876894801. Its totient is φ = 69546550454784.

The previous prime is 208639998029371. The next prime is 208639998029377. The reversal of 208639998029376 is 673920899936802.

The square root of 208639998029376 is 14444376.

It is a perfect power (a square), and thus also a powerful number.

208639998029376 is a `hidden beast` number, since 2 + 0 + 8 + 63 + 9 + 99 + 80 + 29 + 376 = 666.

It can be written as a sum of positive squares in only one way, i.e., 200324275776 + 208439673753600 = 447576^2 + 14437440^2 .

It is a junction number, because it is equal to n+sod(n) for n = 208639998029295 and 208639998029304.

It is not an unprimeable number, because it can be changed into a prime (208639998029371) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 346364100 + ... + 346965948.

Almost surely, 2^{208639998029376} is an apocalyptic number.

208639998029376 is the 14444376-th square number.

It is an amenable number.

208639998029376 is an abundant number, since it is smaller than the sum of its proper divisors (389389878865425).

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

208639998029376 is an frugal number, since it uses more digits than its factorization.

208639998029376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203716 (or 601854 counting only the distinct ones).

The product of its (nonzero) digits is 3809369088, while the sum is 81.

The spelling of 208639998029376 in words is "two hundred eight trillion, six hundred thirty-nine billion, nine hundred ninety-eight million, twenty-nine thousand, three hundred seventy-six".