208139928912 has 400 divisors, whose sum is σ = 641958443280. Its totient is φ = 64989388800.

The previous prime is 208139928863. The next prime is 208139928937. The reversal of 208139928912 is 219829931802.

It can be written as a sum of positive squares in 8 ways, for example, as 1536953616 + 206602975296 = 39204^2 + 454536^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 451496362 + ... + 451496822.

Almost surely, 2^208139928912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 208139928912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320979221640).

208139928912 is an abundant number, since it is smaller than the sum of its proper divisors (433818514368).

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

208139928912 is a wasteful number, since it uses less digits than its factorization.

208139928912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844 (or 829 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The spelling of 208139928912 in words is "two hundred eight billion, one hundred thirty-nine million, nine hundred twenty-eight thousand, nine hundred twelve".