208915638648 has 32 divisors (see below), whose sum is σ = 522302524800. Its totient is φ = 69636755808.

The previous prime is 208915638641. The next prime is 208915638671. The reversal of 208915638648 is 846836519802.

It is a super-2 number, since 2×208915638648² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 208915638591 and 208915638600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208915638641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1116015 + ... + 1289697.

It is an arithmetic number, because the mean of its divisors is an integer number (16321953900).

Almost surely, 2^208915638648 is an apocalyptic number.

It is an amenable number.

208915638648 is an abundant number, since it is smaller than the sum of its proper divisors (313386886152).

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

208915638648 is a wasteful number, since it uses less digits than its factorization.

208915638648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223811 (or 223807 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 60.

The spelling of 208915638648 in words is "two hundred eight billion, nine hundred fifteen million, six hundred thirty-eight thousand, six hundred forty-eight".