208634028681 has 8 divisors (see below), whose sum is σ = 299577066880. Its totient is φ = 128390171472.

The previous prime is 208634028661. The next prime is 208634028697. The reversal of 208634028681 is 186820436802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 208634028681 - 2⁵ = 208634028649 is a prime.

It is a super-2 number, since 2×208634028681² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 208634028681.

It is not an unprimeable number, because it can be changed into a prime (208634028611) 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, 2674795201 + ... + 2674795278.

It is an arithmetic number, because the mean of its divisors is an integer number (37447133360).

Almost surely, 2^208634028681 is an apocalyptic number.

It is an amenable number.

208634028681 is a deficient number, since it is larger than the sum of its proper divisors (90943038199).

208634028681 is a wasteful number, since it uses less digits than its factorization.

208634028681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5349590495.

The product of its (nonzero) digits is 884736, while the sum is 48.

The spelling of 208634028681 in words is "two hundred eight billion, six hundred thirty-four million, twenty-eight thousand, six hundred eighty-one".