645070 has 16 divisors (see below), whose sum is σ = 1170288. Its totient is φ = 256000.

The previous prime is 645067. The next prime is 645077. The reversal of 645070 is 70546.

645070 = 170² + 171² + ... + 189².

It is a super-2 number, since 2×645070² = 832230609800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2382 + ... + 2638.

It is an arithmetic number, because the mean of its divisors is an integer number (73143).

2⁶⁴⁵⁰⁷⁰ is an apocalyptic number.

645070 is a deficient number, since it is larger than the sum of its proper divisors (525218).

645070 is a wasteful number, since it uses less digits than its factorization.

645070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 645070 is about 803.1624991246. The cubic root of 645070 is about 86.4043514898.

The spelling of 645070 in words is "six hundred forty-five thousand, seventy".