198478980 has 72 divisors (see below), whose sum is σ = 688064832. Its totient is φ = 45366336.

The previous prime is 198478913. The next prime is 198478981. The reversal of 198478980 is 89874891.

198478980 is a `hidden beast` number, since 1 + 98 + 478 + 9 + 80 = 666.

It is not an unprimeable number, because it can be changed into a prime (198478981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77502 + ... + 80021.

It is an arithmetic number, because the mean of its divisors is an integer number (9556456).

Almost surely, 2^198478980 is an apocalyptic number.

198478980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198478980 is an abundant number, since it is smaller than the sum of its proper divisors (489585852).

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

198478980 is a wasteful number, since it uses less digits than its factorization.

198478980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157545 (or 157540 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The square root of 198478980 is about 14088.2568119693. The cubic root of 198478980 is about 583.3172770184.

The spelling of 198478980 in words is "one hundred ninety-eight million, four hundred seventy-eight thousand, nine hundred eighty".