620257 has 8 divisors (see below), whose sum is σ = 684000. Its totient is φ = 557760.

The previous prime is 620251. The next prime is 620261. The reversal of 620257 is 752026.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620251) 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, 994 + ... + 1492.

It is an arithmetic number, because the mean of its divisors is an integer number (85500).

2⁶²⁰²⁵⁷ is an apocalyptic number.

It is an amenable number.

620257 is a deficient number, since it is larger than the sum of its proper divisors (63743).

620257 is a wasteful number, since it uses less digits than its factorization.

620257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 620257 is about 787.5639656561. The cubic root of 620257 is about 85.2819701616.

Subtracting 620257 from its reverse (752026), we obtain a square (131769 = 363²).

The spelling of 620257 in words is "six hundred twenty thousand, two hundred fifty-seven".