620730 has 96 divisors (see below), whose sum is σ = 1915200. Its totient is φ = 142560.

The previous prime is 620717. The next prime is 620731. The reversal of 620730 is 37026.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (620731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32661 + ... + 32679.

It is an arithmetic number, because the mean of its divisors is an integer number (19950).

2⁶²⁰⁷³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (957600).

620730 is an abundant number, since it is smaller than the sum of its proper divisors (1294470).

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

620730 is a wasteful number, since it uses less digits than its factorization.

620730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 620730 is about 787.8642014967. The cubic root of 620730 is about 85.3036429641.

Adding to 620730 its reverse (37026), we get a palindrome (657756).

It can be divided in two parts, 6 and 20730, that added together give a 4-th power (20736 = 12⁴).

The spelling of 620730 in words is "six hundred twenty thousand, seven hundred thirty".