198540678 has 48 divisors (see below), whose sum is σ = 469013760. Its totient is φ = 54884880.

The previous prime is 198540677. The next prime is 198540679. The reversal of 198540678 is 876045891.

It is an interprime number because it is at equal distance from previous prime (198540677) and next prime (198540679).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198540677) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 37903 + ... + 42821.

It is an arithmetic number, because the mean of its divisors is an integer number (9771120).

Almost surely, 2^198540678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198540678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234506880).

198540678 is an abundant number, since it is smaller than the sum of its proper divisors (270473082).

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

198540678 is a wasteful number, since it uses less digits than its factorization.

198540678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4993 (or 4962 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 48.

The square root of 198540678 is about 14090.4463378560. The cubic root of 198540678 is about 583.3777129410.

The spelling of 198540678 in words is "one hundred ninety-eight million, five hundred forty thousand, six hundred seventy-eight".