19898562408 has 64 divisors (see below), whose sum is σ = 51145944960. Its totient is φ = 6446635776.

The previous prime is 19898562353. The next prime is 19898562427. The reversal of 19898562408 is 80426589891.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 847110 + ... + 870282.

It is an arithmetic number, because the mean of its divisors is an integer number (799155390).

Almost surely, 2^19898562408 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 19898562408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25572972480).

19898562408 is an abundant number, since it is smaller than the sum of its proper divisors (31247382552).

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

19898562408 is a wasteful number, since it uses less digits than its factorization.

19898562408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24186 (or 24182 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 60.

The spelling of 19898562408 in words is "nineteen billion, eight hundred ninety-eight million, five hundred sixty-two thousand, four hundred eight".