620540 has 48 divisors (see below), whose sum is σ = 1451520. Its totient is φ = 221760.

The previous prime is 620531. The next prime is 620549. The reversal of 620540 is 45026.

620540 = 275² + 276² + ... + 282².

It is an interprime number because it is at equal distance from previous prime (620531) and next prime (620549).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 620540.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8705 + ... + 8775.

It is an arithmetic number, because the mean of its divisors is an integer number (30240).

2⁶²⁰⁵⁴⁰ 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 620540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (725760).

620540 is an abundant number, since it is smaller than the sum of its proper divisors (830980).

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

620540 is a wasteful number, since it uses less digits than its factorization.

620540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 620540 is about 787.7436131128. The cubic root of 620540 is about 85.2949385107.

Adding to 620540 its reverse (45026), we get a palindrome (665566).

The spelling of 620540 in words is "six hundred twenty thousand, five hundred forty".