491669904 has 40 divisors (see below), whose sum is σ = 1385616672. Its totient is φ = 148990720.

The previous prime is 491669891. The next prime is 491669917. The reversal of 491669904 is 409966194.

It is an interprime number because it is at equal distance from previous prime (491669891) and next prime (491669917).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465069 + ... + 466124.

Almost surely, 2^491669904 is an apocalyptic number.

491669904 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

491669904 is an abundant number, since it is smaller than the sum of its proper divisors (893946768).

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

491669904 is a wasteful number, since it uses less digits than its factorization.

491669904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931215 (or 931209 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 491669904 is about 22173.6308258255. The cubic root of 491669904 is about 789.2680845926.

The spelling of 491669904 in words is "four hundred ninety-one million, six hundred sixty-nine thousand, nine hundred four".