491335780 has 24 divisors (see below), whose sum is σ = 1111175352. Its totient is φ = 181416192.

The previous prime is 491335769. The next prime is 491335787. The reversal of 491335780 is 87533194.

It can be written as a sum of positive squares in 4 ways, for example, as 100641024 + 390694756 = 10032^2 + 19766^2 .

It is not an unprimeable number, because it can be changed into a prime (491335787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 944617 + ... + 945136.

It is an arithmetic number, because the mean of its divisors is an integer number (46298973).

Almost surely, 2^491335780 is an apocalyptic number.

It is an amenable number.

491335780 is an abundant number, since it is smaller than the sum of its proper divisors (619839572).

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

491335780 is a wasteful number, since it uses less digits than its factorization.

491335780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889775 (or 1889773 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 491335780 is about 22166.0952808563. The cubic root of 491335780 is about 789.0892565028.

The spelling of 491335780 in words is "four hundred ninety-one million, three hundred thirty-five thousand, seven hundred eighty".