628530 has 64 divisors (see below), whose sum is σ = 1790208. Its totient is φ = 138240.

The previous prime is 628499. The next prime is 628547. The reversal of 628530 is 35826.

628530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 628530.

It is a congruent number.

It is an unprimeable number.

628530 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 31 ways as a sum of consecutive naturals, for example, 8574 + ... + 8646.

It is an arithmetic number, because the mean of its divisors is an integer number (27972).

2⁶²⁸⁵³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 628530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (895104).

628530 is an abundant number, since it is smaller than the sum of its proper divisors (1161678).

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

628530 is a wasteful number, since it uses less digits than its factorization.

628530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 628530 is about 792.7988395552. The cubic root of 628530 is about 85.6594609721.

Subtracting from 628530 its reverse (35826), we obtain a cube (592704 = 84³).

The spelling of 628530 in words is "six hundred twenty-eight thousand, five hundred thirty".