491667456 has 120 divisors (see below), whose sum is σ = 1499417920. Its totient is φ = 140378112.

The previous prime is 491667443. The next prime is 491667457. The reversal of 491667456 is 654766194.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491667457) 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, 343350 + ... + 344778.

Almost surely, 2^491667456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491667456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (749708960).

491667456 is an abundant number, since it is smaller than the sum of its proper divisors (1007750464).

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

491667456 is an equidigital number, since it uses as much as digits as its factorization.

491667456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467 (or 1441 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 48.

The square root of 491667456 is about 22173.5756250543. The cubic root of 491667456 is about 789.2667746816.

The spelling of 491667456 in words is "four hundred ninety-one million, six hundred sixty-seven thousand, four hundred fifty-six".