208705057870 has 48 divisors (see below), whose sum is σ = 420070826160. Its totient is φ = 74435963904.

The previous prime is 208705057861. The next prime is 208705057879. The reversal of 208705057870 is 78750507802.

It is a happy number.

208705057870 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (208705057861) and next prime (208705057879).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208705057879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1845519 + ... + 1955338.

It is an arithmetic number, because the mean of its divisors is an integer number (8751475545).

Almost surely, 2^208705057870 is an apocalyptic number.

208705057870 is an abundant number, since it is smaller than the sum of its proper divisors (211365768290).

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

208705057870 is a wasteful number, since it uses less digits than its factorization.

208705057870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3800917 (or 3800900 counting only the distinct ones).

The product of its (nonzero) digits is 1097600, while the sum is 49.

The spelling of 208705057870 in words is "two hundred eight billion, seven hundred five million, fifty-seven thousand, eight hundred seventy".