645130 has 8 divisors (see below), whose sum is σ = 1161252. Its totient is φ = 258048.

The previous prime is 645097. The next prime is 645131. The reversal of 645130 is 31546.

It can be written as a sum of positive squares in 2 ways, for example, as 613089 + 32041 = 783^2 + 179^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 645098 and 645107.

It is not an unprimeable number, because it can be changed into a prime (645131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32247 + ... + 32266.

2⁶⁴⁵¹³⁰ is an apocalyptic number.

645130 is a deficient number, since it is larger than the sum of its proper divisors (516122).

645130 is a wasteful number, since it uses less digits than its factorization.

645130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64520.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 645130 is about 803.1998505976. The cubic root of 645130 is about 86.4070303207.

Adding to 645130 its reverse (31546), we get a palindrome (676676).

The spelling of 645130 in words is "six hundred forty-five thousand, one hundred thirty".