620843281 has 8 divisors (see below), whose sum is σ = 680031720. Its totient is φ = 564173568.

The previous prime is 620843273. The next prime is 620843291. The reversal of 620843281 is 182348026.

It can be written as a sum of positive squares in 4 ways, for example, as 101687056 + 519156225 = 10084^2 + 22785^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 620843281 - 2³ = 620843273 is a prime.

It is a super-2 number, since 2×620843281² = 770892759125689922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620843261) 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, 629166 + ... + 630151.

It is an arithmetic number, because the mean of its divisors is an integer number (85003965).

Almost surely, 2^620843281 is an apocalyptic number.

It is an amenable number.

620843281 is a deficient number, since it is larger than the sum of its proper divisors (59188439).

620843281 is a wasteful number, since it uses less digits than its factorization.

620843281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259363.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 620843281 is about 24916.7269319227. The cubic root of 620843281 is about 853.0883185148.

The spelling of 620843281 in words is "six hundred twenty million, eight hundred forty-three thousand, two hundred eighty-one".