620564 has 24 divisors (see below), whose sum is σ = 1276800. Its totient is φ = 258336.

The previous prime is 620561. The next prime is 620567. The reversal of 620564 is 465026.

620564 = T₇ + T₈ + ... + T₁₅₄.

It is an interprime number because it is at equal distance from previous prime (620561) and next prime (620567).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737 + ... + 1335.

It is an arithmetic number, because the mean of its divisors is an integer number (53200).

2⁶²⁰⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (638400).

620564 is an abundant number, since it is smaller than the sum of its proper divisors (656236).

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

620564 is a wasteful number, since it uses less digits than its factorization.

620564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647 (or 645 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 620564 is about 787.7588463483. The cubic root of 620564 is about 85.2960381186.

The spelling of 620564 in words is "six hundred twenty thousand, five hundred sixty-four".