208990137744 has 160 divisors (see below), whose sum is σ = 626301699840. Its totient is φ = 66598253568.

The previous prime is 208990137743. The next prime is 208990137793. The reversal of 208990137744 is 447731099802.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (208990137743) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22818414 + ... + 22827570.

It is an arithmetic number, because the mean of its divisors is an integer number (3914385624).

Almost surely, 2^208990137744 is an apocalyptic number.

208990137744 is a gapful number since it is divisible by the number (24) 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 208990137744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (313150849920).

208990137744 is an abundant number, since it is smaller than the sum of its proper divisors (417311562096).

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

208990137744 is a wasteful number, since it uses less digits than its factorization.

208990137744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11494 (or 11482 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 208990137744 in words is "two hundred eight billion, nine hundred ninety million, one hundred thirty-seven thousand, seven hundred forty-four".