491443560 has 192 divisors, whose sum is σ = 1667952000. Its totient is φ = 125379072.

The previous prime is 491443559. The next prime is 491443567. The reversal of 491443560 is 65344194.

491443560 = 478² + 479² + ... + 1165².

491443560 is a `hidden beast` number, since 4 + 91 + 4 + 4 + 3 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (491443567) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 820141 + ... + 820739.

It is an arithmetic number, because the mean of its divisors is an integer number (8687250).

Almost surely, 2^491443560 is an apocalyptic number.

491443560 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 491443560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (833976000).

491443560 is an abundant number, since it is smaller than the sum of its proper divisors (1176508440).

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

491443560 is a wasteful number, since it uses less digits than its factorization.

491443560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712 (or 705 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 491443560 is about 22168.5263380316. The cubic root of 491443560 is about 789.1469508030.

The spelling of 491443560 in words is "four hundred ninety-one million, four hundred forty-three thousand, five hundred sixty".