491992320 has 144 divisors (see below), whose sum is σ = 1622380032. Its totient is φ = 126935040.

The previous prime is 491992297. The next prime is 491992373. The reversal of 491992320 is 23299194.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116974 + ... + 121106.

It is an arithmetic number, because the mean of its divisors is an integer number (11266528).

Almost surely, 2^491992320 is an apocalyptic number.

491992320 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 491992320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (811190016).

491992320 is an abundant number, since it is smaller than the sum of its proper divisors (1130387712).

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

491992320 is a wasteful number, since it uses less digits than its factorization.

491992320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4188 (or 4174 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 491992320 is about 22180.8998915734. The cubic root of 491992320 is about 789.4405695958.

The spelling of 491992320 in words is "four hundred ninety-one million, nine hundred ninety-two thousand, three hundred twenty".