491325870 has 64 divisors (see below), whose sum is σ = 1352203776. Its totient is φ = 111922560.

The previous prime is 491325853. The next prime is 491325871. The reversal of 491325870 is 78523194.

It is a super-2 number, since 2×491325870² = 482802221062513800, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491325871) 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, 60660 + ... + 68280.

It is an arithmetic number, because the mean of its divisors is an integer number (21128184).

Almost surely, 2^491325870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491325870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (676101888).

491325870 is an abundant number, since it is smaller than the sum of its proper divisors (860877906).

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

491325870 is a wasteful number, since it uses less digits than its factorization.

491325870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7945.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 491325870 is about 22165.8717401324. The cubic root of 491325870 is about 789.0839512869.

The spelling of 491325870 in words is "four hundred ninety-one million, three hundred twenty-five thousand, eight hundred seventy".