491255280 has 200 divisors, whose sum is σ = 1743584832. Its totient is φ = 128134656.

The previous prime is 491255257. The next prime is 491255287. The reversal of 491255280 is 82552194.

491255280 is a `hidden beast` number, since 4 + 9 + 125 + 528 + 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 not an unprimeable number, because it can be changed into a prime (491255287) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 303754 + ... + 305366.

Almost surely, 2^491255280 is an apocalyptic number.

491255280 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 491255280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (871792416).

491255280 is an abundant number, since it is smaller than the sum of its proper divisors (1252329552).

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

491255280 is a wasteful number, since it uses less digits than its factorization.

491255280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685 (or 1670 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 491255280 is about 22164.2793701938. The cubic root of 491255280 is about 789.0461595976.

The spelling of 491255280 in words is "four hundred ninety-one million, two hundred fifty-five thousand, two hundred eighty".