491640600 has 192 divisors, whose sum is σ = 1676499840. Its totient is φ = 118195200.

The previous prime is 491640593. The next prime is 491640601. The reversal of 491640600 is 6046194.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491640601) 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, 1075572 + ... + 1076028.

It is an arithmetic number, because the mean of its divisors is an integer number (8731770).

Almost surely, 2^491640600 is an apocalyptic number.

491640600 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 491640600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (838249920).

491640600 is an abundant number, since it is smaller than the sum of its proper divisors (1184859240).

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

491640600 is a wasteful number, since it uses less digits than its factorization.

491640600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 641 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 491640600 is about 22172.9700310987. The cubic root of 491640600 is about 789.2524039016.

Adding to 491640600 its reverse (6046194), we get a palindrome (497686794).

The spelling of 491640600 in words is "four hundred ninety-one million, six hundred forty thousand, six hundred".