491706642 has 32 divisors (see below), whose sum is σ = 1124785152. Its totient is φ = 140377104.

The previous prime is 491706619. The next prime is 491706647. The reversal of 491706642 is 246607194.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 491706642.

It is not an unprimeable number, because it can be changed into a prime (491706647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60123 + ... + 67809.

It is an arithmetic number, because the mean of its divisors is an integer number (35149536).

Almost surely, 2^491706642 is an apocalyptic number.

491706642 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

491706642 is an abundant number, since it is smaller than the sum of its proper divisors (633078510).

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

491706642 is a wasteful number, since it uses less digits than its factorization.

491706642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9222.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 491706642 is about 22174.4592267771. The cubic root of 491706642 is about 789.2877423674.

The spelling of 491706642 in words is "four hundred ninety-one million, seven hundred six thousand, six hundred forty-two".