491680 has 48 divisors (see below), whose sum is σ = 1330560. Its totient is φ = 168192.

The previous prime is 491677. The next prime is 491707. The reversal of 491680 is 86194.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 901 + ... + 1339.

It is an arithmetic number, because the mean of its divisors is an integer number (27720).

2⁴⁹¹⁶⁸⁰ is an apocalyptic number.

491680 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (665280).

491680 is an abundant number, since it is smaller than the sum of its proper divisors (838880).

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

491680 is a wasteful number, since it uses less digits than its factorization.

491680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 491680 is about 701.1989731881. The cubic root of 491680 is about 78.9273486859.

The spelling of 491680 in words is "four hundred ninety-one thousand, six hundred eighty".