491657892 has 96 divisors (see below), whose sum is σ = 1316818944. Its totient is φ = 141398400.

The previous prime is 491657879. The next prime is 491657899. The reversal of 491657892 is 298756194.

It is not an unprimeable number, because it can be changed into a prime (491657899) 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, 215743 + ... + 218009.

It is an arithmetic number, because the mean of its divisors is an integer number (13716864).

Almost surely, 2^491657892 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 491657892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (658409472).

491657892 is an abundant number, since it is smaller than the sum of its proper divisors (825161052).

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

491657892 is a wasteful number, since it uses less digits than its factorization.

491657892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2369 (or 2367 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The square root of 491657892 is about 22173.3599619002. The cubic root of 491657892 is about 789.2616569973.

The spelling of 491657892 in words is "four hundred ninety-one million, six hundred fifty-seven thousand, eight hundred ninety-two".