491889770 has 16 divisors (see below), whose sum is σ = 886710240. Its totient is φ = 196465104.

The previous prime is 491889731. The next prime is 491889773. The reversal of 491889770 is 77988194.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (491889773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29180 + ... + 42839.

It is an arithmetic number, because the mean of its divisors is an integer number (55419390).

Almost surely, 2^491889770 is an apocalyptic number.

491889770 is a deficient number, since it is larger than the sum of its proper divisors (394820470).

491889770 is a wasteful number, since it uses less digits than its factorization.

491889770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72709.

The product of its (nonzero) digits is 1016064, while the sum is 53.

The square root of 491889770 is about 22178.5880975323. The cubic root of 491889770 is about 789.3857159239.

The spelling of 491889770 in words is "four hundred ninety-one million, eight hundred eighty-nine thousand, seven hundred seventy".