208728053615 has 4 divisors (see below), whose sum is σ = 250473664344. Its totient is φ = 166982442888.

The previous prime is 208728053609. The next prime is 208728053629. The reversal of 208728053615 is 516350827802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 208728053615 - 2¹⁰ = 208728052591 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 208728053615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20872805357 + ... + 20872805366.

It is an arithmetic number, because the mean of its divisors is an integer number (62618416086).

Almost surely, 2^208728053615 is an apocalyptic number.

208728053615 is a deficient number, since it is larger than the sum of its proper divisors (41745610729).

208728053615 is an equidigital number, since it uses as much as digits as its factorization.

208728053615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41745610728.

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 208728053615 in words is "two hundred eight billion, seven hundred twenty-eight million, fifty-three thousand, six hundred fifteen".