491212620 has 192 divisors, whose sum is σ = 1642515840. Its totient is φ = 121430016.

The previous prime is 491212597. The next prime is 491212661. The reversal of 491212620 is 26212194.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 669774 + ... + 670506.

It is an arithmetic number, because the mean of its divisors is an integer number (8554770).

Almost surely, 2^491212620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491212620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (821257920).

491212620 is an abundant number, since it is smaller than the sum of its proper divisors (1151303220).

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

491212620 is a wasteful number, since it uses less digits than its factorization.

491212620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841 (or 833 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 491212620 is about 22163.3169900175. The cubic root of 491212620 is about 789.0233190060.

The spelling of 491212620 in words is "four hundred ninety-one million, two hundred twelve thousand, six hundred twenty".