208638057 has 8 divisors (see below), whose sum is σ = 278279680. Its totient is φ = 139044240.

The previous prime is 208638047. The next prime is 208638103. The reversal of 208638057 is 750836802.

208638057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 208638057 - 2¹¹ = 208636009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208638047) 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, 82 + ... + 20427.

It is an arithmetic number, because the mean of its divisors is an integer number (34784960).

Almost surely, 2^208638057 is an apocalyptic number.

It is an amenable number.

208638057 is a deficient number, since it is larger than the sum of its proper divisors (69641623).

208638057 is a wasteful number, since it uses less digits than its factorization.

208638057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23903.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 208638057 is about 14444.3088100470. The cubic root of 208638057 is about 593.1044418282.

It can be divided in two parts, 20863 and 8057, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 208638057 in words is "two hundred eight million, six hundred thirty-eight thousand, fifty-seven".