17990845908 has 96 divisors (see below), whose sum is σ = 49914052608. Its totient is φ = 4935168000.

The previous prime is 17990845903. The next prime is 17990845937. The reversal of 17990845908 is 80954809971.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17990845903) 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, 303508 + ... + 357908.

It is an arithmetic number, because the mean of its divisors is an integer number (519938048).

Almost surely, 2^17990845908 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 17990845908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24957026304).

17990845908 is an abundant number, since it is smaller than the sum of its proper divisors (31923206700).

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

17990845908 is a wasteful number, since it uses less digits than its factorization.

17990845908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54573 (or 54571 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 60.

The spelling of 17990845908 in words is "seventeen billion, nine hundred ninety million, eight hundred forty-five thousand, nine hundred eight".