620556 has 12 divisors (see below), whose sum is σ = 1447992. Its totient is φ = 206848.

The previous prime is 620549. The next prime is 620561. The reversal of 620556 is 655026.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25845 + ... + 25868.

It is an arithmetic number, because the mean of its divisors is an integer number (120666).

2⁶²⁰⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

620556 is an abundant number, since it is smaller than the sum of its proper divisors (827436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

620556 is a wasteful number, since it uses less digits than its factorization.

620556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51720 (or 51718 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 620556 is about 787.7537686359. The cubic root of 620556 is about 85.2956715858.

It can be divided in two parts, 620 and 556, that added together give a triangular number (1176 = T₄₈).

The spelling of 620556 in words is "six hundred twenty thousand, five hundred fifty-six".