645412 has 12 divisors (see below), whose sum is σ = 1135260. Its totient is φ = 321056.

The previous prime is 645409. The next prime is 645419. The reversal of 645412 is 214546.

It can be written as a sum of positive squares in 2 ways, for example, as 256036 + 389376 = 506^2 + 624^2 .

It is not an unprimeable number, because it can be changed into a prime (645419) 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, 1014 + ... + 1522.

It is an arithmetic number, because the mean of its divisors is an integer number (94605).

2⁶⁴⁵⁴¹² is an apocalyptic number.

It is an amenable number.

645412 is a deficient number, since it is larger than the sum of its proper divisors (489848).

645412 is a wasteful number, since it uses less digits than its factorization.

645412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830 (or 828 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 645412 is about 803.3753792593. The cubic root of 645412 is about 86.4196186016.

Adding to 645412 its reverse (214546), we get a palindrome (859958).

It can be divided in two parts, 64 and 5412, that added together give a square (5476 = 74²).

The spelling of 645412 in words is "six hundred forty-five thousand, four hundred twelve".