491760198 has 24 divisors (see below), whose sum is σ = 1068853968. Its totient is φ = 163401072.

The previous prime is 491760197. The next prime is 491760211. The reversal of 491760198 is 891067194.

It is a happy number.

491760198 is a `hidden beast` number, since 491 + 76 + 0 + 1 + 98 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491760197) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37386 + ... + 48797.

It is an arithmetic number, because the mean of its divisors is an integer number (44535582).

Almost surely, 2^491760198 is an apocalyptic number.

491760198 is an abundant number, since it is smaller than the sum of its proper divisors (577093770).

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

491760198 is a wasteful number, since it uses less digits than its factorization.

491760198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86508 (or 86505 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 491760198 is about 22175.6667994448. Note that the first 3 decimals coincide. The cubic root of 491760198 is about 789.3163973662.

The spelling of 491760198 in words is "four hundred ninety-one million, seven hundred sixty thousand, one hundred ninety-eight".