491489280 has 144 divisors (see below), whose sum is σ = 1703732940. Its totient is φ = 131039232.

The previous prime is 491489249. The next prime is 491489291. The reversal of 491489280 is 82984194.

491489280 is a `hidden beast` number, since 4 + 91 + 489 + 2 + 80 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 450118656 + 41370624 = 21216^2 + 6432^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89494 + ... + 94826.

Almost surely, 2^491489280 is an apocalyptic number.

491489280 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 491489280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (851866470).

491489280 is an abundant number, since it is smaller than the sum of its proper divisors (1212243660).

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

491489280 is a wasteful number, since it uses less digits than its factorization.

491489280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5366 (or 5343 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 491489280 is about 22169.5575057329. The cubic root of 491489280 is about 789.1714220294.

The spelling of 491489280 in words is "four hundred ninety-one million, four hundred eighty-nine thousand, two hundred eighty".