491490720 has 192 divisors, whose sum is σ = 1966083840. Its totient is φ = 112333824.

The previous prime is 491490719. The next prime is 491490733. The reversal of 491490720 is 27094194.

It is a super-2 number, since 2×491490720² = 483126255692236800, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22114 + ... + 38366.

It is an arithmetic number, because the mean of its divisors is an integer number (10240020).

Almost surely, 2^491490720 is an apocalyptic number.

491490720 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 491490720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (983041920).

491490720 is an abundant number, since it is smaller than the sum of its proper divisors (1474593120).

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

491490720 is a wasteful number, since it uses less digits than its factorization.

491490720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16284 (or 16270 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 491490720 is about 22169.5899826767. The cubic root of 491490720 is about 789.1721927520.

The spelling of 491490720 in words is "four hundred ninety-one million, four hundred ninety thousand, seven hundred twenty".