208128811902 has 64 divisors (see below), whose sum is σ = 469986140160. Its totient is φ = 60873573600.

The previous prime is 208128811883. The next prime is 208128811921. The reversal of 208128811902 is 209118821802.

It is an interprime number because it is at equal distance from previous prime (208128811883) and next prime (208128811921).

It is a super-3 number, since 3×208128811902³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 641233 + ... + 909635.

It is an arithmetic number, because the mean of its divisors is an integer number (7343533440).

Almost surely, 2^208128811902 is an apocalyptic number.

208128811902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 208128811902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234993070080).

208128811902 is an abundant number, since it is smaller than the sum of its proper divisors (261857328258).

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

208128811902 is a wasteful number, since it uses less digits than its factorization.

208128811902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268829.

The product of its (nonzero) digits is 36864, while the sum is 42.

The spelling of 208128811902 in words is "two hundred eight billion, one hundred twenty-eight million, eight hundred eleven thousand, nine hundred two".