645430 has 32 divisors (see below), whose sum is σ = 1267200. Its totient is φ = 235872.

The previous prime is 645419. The next prime is 645431. The reversal of 645430 is 34546.

It is a super-3 number, since 3×645430³ = 806619465333021000, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645431) 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 15 ways as a sum of consecutive naturals, for example, 8131 + ... + 8209.

It is an arithmetic number, because the mean of its divisors is an integer number (39600).

2⁶⁴⁵⁴³⁰ is an apocalyptic number.

645430 is a deficient number, since it is larger than the sum of its proper divisors (621770).

645430 is a wasteful number, since it uses less digits than its factorization.

645430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 645430 is about 803.3865819143. The cubic root of 645430 is about 86.4204219844.

Adding to 645430 its reverse (34546), we get a palindrome (679976).

The spelling of 645430 in words is "six hundred forty-five thousand, four hundred thirty".