491942780 has 24 divisors (see below), whose sum is σ = 1180663008. Its totient is φ = 168666048.

The previous prime is 491942771. The next prime is 491942797. The reversal of 491942780 is 87249194.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1756799 + ... + 1757078.

It is an arithmetic number, because the mean of its divisors is an integer number (49194292).

Almost surely, 2^491942780 is an apocalyptic number.

It is an amenable number.

491942780 is an abundant number, since it is smaller than the sum of its proper divisors (688720228).

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

491942780 is a wasteful number, since it uses less digits than its factorization.

491942780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3513893 (or 3513891 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 491942780 is about 22179.7831369019. The cubic root of 491942780 is about 789.4140717577.

The spelling of 491942780 in words is "four hundred ninety-one million, nine hundred forty-two thousand, seven hundred eighty".