620724 has 48 divisors (see below), whose sum is σ = 1636992. Its totient is φ = 181632.

The previous prime is 620717. The next prime is 620731. The reversal of 620724 is 427026.

It is a happy number.

620724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (620717) and next prime (620731).

It is a self number, because there is not a number n which added to its sum of digits gives 620724.

It is a congruent number.

It is an unprimeable number.

620724 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3502 + ... + 3674.

It is an arithmetic number, because the mean of its divisors is an integer number (34104).

2⁶²⁰⁷²⁴ 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 620724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (818496).

620724 is an abundant number, since it is smaller than the sum of its proper divisors (1016268).

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

620724 is a wasteful number, since it uses less digits than its factorization.

620724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 620724 is about 787.8603937247. The cubic root of 620724 is about 85.3033681138.

The spelling of 620724 in words is "six hundred twenty thousand, seven hundred twenty-four".