491669888 has 32 divisors (see below), whose sum is σ = 993312720. Its totient is φ = 242368000.

The previous prime is 491669881. The next prime is 491669891. The reversal of 491669888 is 888966194.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491669881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17963 + ... + 36138.

Almost surely, 2^491669888 is an apocalyptic number.

It is an amenable number.

491669888 is an abundant number, since it is smaller than the sum of its proper divisors (501642832).

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

491669888 is an equidigital number, since it uses as much as digits as its factorization.

491669888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54186 (or 54174 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 59.

The square root of 491669888 is about 22173.6304650366. The cubic root of 491669888 is about 789.2680760311.

The spelling of 491669888 in words is "four hundred ninety-one million, six hundred sixty-nine thousand, eight hundred eighty-eight".