620857 has 8 divisors (see below), whose sum is σ = 669600. Its totient is φ = 573504.

The previous prime is 620849. The next prime is 620869. The reversal of 620857 is 758026.

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 620857 - 2³ = 620849 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (620827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 694 + ... + 1312.

It is an arithmetic number, because the mean of its divisors is an integer number (83700).

2⁶²⁰⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

620857 is a deficient number, since it is larger than the sum of its proper divisors (48743).

620857 is a wasteful number, since it uses less digits than its factorization.

620857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 620857 is about 787.9447950206. The cubic root of 620857 is about 85.3094602136.

The spelling of 620857 in words is "six hundred twenty thousand, eight hundred fifty-seven".