491563800 has 288 divisors, whose sum is σ = 2032474080. Its totient is φ = 103680000.

The previous prime is 491563799. The next prime is 491563829. The reversal of 491563800 is 8365194.

491563800 is a `hidden beast` number, since 4 + 9 + 15 + 638 + 0 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 162300 + ... + 165300.

Almost surely, 2^491563800 is an apocalyptic number.

491563800 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 491563800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1016237040).

491563800 is an abundant number, since it is smaller than the sum of its proper divisors (1540910280).

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

491563800 is a wasteful number, since it uses less digits than its factorization.

491563800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3043 (or 3031 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 491563800 is about 22171.2381251025. The cubic root of 491563800 is about 789.2113049490.

The spelling of 491563800 in words is "four hundred ninety-one million, five hundred sixty-three thousand, eight hundred".