198615816 has 144 divisors (see below), whose sum is σ = 658897200. Its totient is φ = 53742528.

The previous prime is 198615779. The next prime is 198615829. The reversal of 198615816 is 618516891.

198615816 is a `hidden beast` number, since 1 + 9 + 8 + 61 + 581 + 6 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 65551 + ... + 68513.

It is an arithmetic number, because the mean of its divisors is an integer number (4575675).

Almost surely, 2^198615816 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 198615816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329448600).

198615816 is an abundant number, since it is smaller than the sum of its proper divisors (460281384).

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

198615816 is a wasteful number, since it uses less digits than its factorization.

198615816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3008 (or 2994 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 198615816 is about 14093.1123602986. The cubic root of 198615816 is about 583.4512970323.

The spelling of 198615816 in words is "one hundred ninety-eight million, six hundred fifteen thousand, eight hundred sixteen".