664430 has 32 divisors (see below), whose sum is σ = 1360800. Its totient is φ = 231552.

The previous prime is 664427. The next prime is 664441. The reversal of 664430 is 34466.

Added to its reverse (34466) it gives a square (698896 = 836²).

664430 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 664396 and 664405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2336 + ... + 2604.

It is an arithmetic number, because the mean of its divisors is an integer number (42525).

2⁶⁶⁴⁴³⁰ is an apocalyptic number.

664430 is an abundant number, since it is smaller than the sum of its proper divisors (696370).

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

664430 is a wasteful number, since it uses less digits than its factorization.

664430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 664430 is about 815.1257571688. The cubic root of 664430 is about 87.2602415982.

Adding to 664430 its reverse (34466), we get a palindrome (698896).

The spelling of 664430 in words is "six hundred sixty-four thousand, four hundred thirty".