620545 has 8 divisors (see below), whose sum is σ = 754560. Its totient is φ = 489840.

The previous prime is 620531. The next prime is 620549. The reversal of 620545 is 545026.

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

It is not a de Polignac number, because 620545 - 2⁹ = 620033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (620549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391 + ... + 1180.

It is an arithmetic number, because the mean of its divisors is an integer number (94320).

It is a Proth number, since it is equal to 303 ⋅ 2¹¹ + 1 and 303 < 2¹¹.

2⁶²⁰⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

620545 is a deficient number, since it is larger than the sum of its proper divisors (134015).

620545 is a wasteful number, since it uses less digits than its factorization.

620545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 620545 is about 787.7467867278. The cubic root of 620545 is about 85.2951675980.

The spelling of 620545 in words is "six hundred twenty thousand, five hundred forty-five".