491390672 has 20 divisors (see below), whose sum is σ = 982782336. Its totient is φ = 237769440.

The previous prime is 491390671. The next prime is 491390681. The reversal of 491390672 is 276093194.

491390672 is an admirable number.

It is a super-3 number, since 3×491390672³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491390671) 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, 494858 + ... + 495849.

Almost surely, 2^491390672 is an apocalyptic number.

It is an amenable number.

491390672 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

491390672 is a wasteful number, since it uses less digits than its factorization.

491390672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990746 (or 990740 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 491390672 is about 22167.3334436057. Note that the first 3 decimals coincide. The cubic root of 491390672 is about 789.1186410746.

The spelling of 491390672 in words is "four hundred ninety-one million, three hundred ninety thousand, six hundred seventy-two".