491309280 has 576 divisors, whose sum is σ = 2192520960. Its totient is φ = 101606400.

The previous prime is 491309257. The next prime is 491309317. The reversal of 491309280 is 82903194.

491309280 is a `hidden beast` number, since 491 + 3 + 0 + 92 + 80 = 666.

It is a super-2 number, since 2×491309280² = 482769617228236800, which contains 22 as substring.

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 95 ways as a sum of consecutive naturals, for example, 2328375 + ... + 2328585.

It is an arithmetic number, because the mean of its divisors is an integer number (3806460).

Almost surely, 2^491309280 is an apocalyptic number.

491309280 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 491309280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1096260480).

491309280 is an abundant number, since it is smaller than the sum of its proper divisors (1701211680).

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

491309280 is a wasteful number, since it uses less digits than its factorization.

491309280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 491309280 is about 22165.4975130269. The cubic root of 491309280 is about 789.0750698426.

The spelling of 491309280 in words is "four hundred ninety-one million, three hundred nine thousand, two hundred eighty".