490278681 has 6 divisors (see below), whose sum is σ = 708180330. Its totient is φ = 326852448.

The previous prime is 490278629. The next prime is 490278707. The reversal of 490278681 is 186872094.

490278681 is a `hidden beast` number, since 490 + 2 + 7 + 86 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 487526400 + 2752281 = 22080^2 + 1659^2 .

It is not a de Polignac number, because 490278681 - 2⁶ = 490278617 is a prime.

It is a super-2 number, since 2×490278681² = 480746370086199522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (490277681) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27237696 + ... + 27237713.

It is an arithmetic number, because the mean of its divisors is an integer number (118030055).

Almost surely, 2^490278681 is an apocalyptic number.

It is an amenable number.

490278681 is a deficient number, since it is larger than the sum of its proper divisors (217901649).

490278681 is a wasteful number, since it uses less digits than its factorization.

490278681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54475415 (or 54475412 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 490278681 is about 22142.2374885647. The cubic root of 490278681 is about 788.5229469783.

The spelling of 490278681 in words is "four hundred ninety million, two hundred seventy-eight thousand, six hundred eighty-one".