646530 has 32 divisors (see below), whose sum is σ = 1620864. Its totient is φ = 164736.

The previous prime is 646523. The next prime is 646537. The reversal of 646530 is 35646.

646530 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 (646523) and next prime (646537).

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 646530.

It is not an unprimeable number, because it can be changed into a prime (646537) 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, 222 + ... + 1158.

It is an arithmetic number, because the mean of its divisors is an integer number (50652).

2⁶⁴⁶⁵³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (810432).

646530 is an abundant number, since it is smaller than the sum of its proper divisors (974334).

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

646530 is a wasteful number, since it uses less digits than its factorization.

646530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 646530 is about 804.0708923969. The cubic root of 646530 is about 86.4694892783.

It can be divided in two parts, 646 and 530, that added together give a triangular number (1176 = T₄₈).

The spelling of 646530 in words is "six hundred forty-six thousand, five hundred thirty".