208707877664 has 144 divisors (see below), whose sum is σ = 486713797920. Its totient is φ = 87329249280.

The previous prime is 208707877649. The next prime is 208707877667. The reversal of 208707877664 is 466778707802.

It is a super-2 number, since 2×208707877664² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 208707877597 and 208707877606.

It is not an unprimeable number, because it can be changed into a prime (208707877667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22541324 + ... + 22550580.

It is an arithmetic number, because the mean of its divisors is an integer number (3379956930).

Almost surely, 2^208707877664 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 208707877664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243356898960).

208707877664 is an abundant number, since it is smaller than the sum of its proper divisors (278005920256).

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

208707877664 is a wasteful number, since it uses less digits than its factorization.

208707877664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9683 (or 9662 counting only the distinct ones).

The product of its (nonzero) digits is 44255232, while the sum is 62.

The spelling of 208707877664 in words is "two hundred eight billion, seven hundred seven million, eight hundred seventy-seven thousand, six hundred sixty-four".