491908004 has 48 divisors (see below), whose sum is σ = 998054400. Its totient is φ = 207792000.

The previous prime is 491907991. The next prime is 491908009. The reversal of 491908004 is 400809194.

It is not an unprimeable number, because it can be changed into a prime (491908009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 654629 + ... + 655379.

It is an arithmetic number, because the mean of its divisors is an integer number (20792800).

Almost surely, 2^491908004 is an apocalyptic number.

It is an amenable number.

491908004 is an abundant number, since it is smaller than the sum of its proper divisors (506146396).

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

491908004 is a wasteful number, since it uses less digits than its factorization.

491908004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068 (or 1066 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 491908004 is about 22178.9991658776. Note that the first 3 decimals coincide. The cubic root of 491908004 is about 789.3954697903.

The spelling of 491908004 in words is "four hundred ninety-one million, nine hundred eight thousand, four".