620557 has 4 divisors (see below), whose sum is σ = 709216. Its totient is φ = 531900.

The previous prime is 620549. The next prime is 620561. The reversal of 620557 is 755026.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 755026 = 2 ⋅377513.

It is a cyclic number.

It is not a de Polignac number, because 620557 - 2³ = 620549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44319 + ... + 44332.

It is an arithmetic number, because the mean of its divisors is an integer number (177304).

2⁶²⁰⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

620557 is a deficient number, since it is larger than the sum of its proper divisors (88659).

620557 is an equidigital number, since it uses as much as digits as its factorization.

620557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88658.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 620557 is about 787.7544033517. The cubic root of 620557 is about 85.2957174026.

The spelling of 620557 in words is "six hundred twenty thousand, five hundred fifty-seven".