208989489540 has 192 divisors, whose sum is σ = 637446829824. Its totient is φ = 50851971072.

The previous prime is 208989489539. The next prime is 208989489557. The reversal of 208989489540 is 45984989802.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 125367787 + ... + 125369453.

It is an arithmetic number, because the mean of its divisors is an integer number (3320035572).

Almost surely, 2^208989489540 is an apocalyptic number.

208989489540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 208989489540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318723414912).

208989489540 is an abundant number, since it is smaller than the sum of its proper divisors (428457340284).

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

208989489540 is a wasteful number, since it uses less digits than its factorization.

208989489540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3446 (or 3444 counting only the distinct ones).

The product of its (nonzero) digits is 59719680, while the sum is 66.

The spelling of 208989489540 in words is "two hundred eight billion, nine hundred eighty-nine million, four hundred eighty-nine thousand, five hundred forty".