491280240 has 160 divisors (see below), whose sum is σ = 1685463552. Its totient is φ = 117376000.

The previous prime is 491280239. The next prime is 491280241. The reversal of 491280240 is 42082194.

It is an interprime number because it is at equal distance from previous prime (491280239) and next prime (491280241).

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

It is a junction number, because it is equal to n+sod(n) for n = 491280198 and 491280207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491280241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 186130 + ... + 188750.

Almost surely, 2^491280240 is an apocalyptic number.

491280240 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 491280240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (842731776).

491280240 is an abundant number, since it is smaller than the sum of its proper divisors (1194183312).

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

491280240 is a wasteful number, since it uses less digits than its factorization.

491280240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2719 (or 2713 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 491280240 is about 22164.8424312017. The cubic root of 491280240 is about 789.0595228186.

The spelling of 491280240 in words is "four hundred ninety-one million, two hundred eighty thousand, two hundred forty".