645250 has 32 divisors (see below), whose sum is σ = 1263600. Its totient is φ = 246400.

The previous prime is 645233. The next prime is 645257. The reversal of 645250 is 52546.

It can be written as a sum of positive squares in 8 ways, for example, as 441 + 644809 = 21^2 + 803^2 .

It is not an unprimeable number, because it can be changed into a prime (645257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7206 + ... + 7294.

2⁶⁴⁵²⁵⁰ is an apocalyptic number.

645250 is a deficient number, since it is larger than the sum of its proper divisors (618350).

645250 is a wasteful number, since it uses less digits than its factorization.

645250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 645250 is about 803.2745483333. The cubic root of 645250 is about 86.4123874843.

Adding to 645250 its reverse (52546), we get a palindrome (697796).

Subtracting from 645250 its reverse (52546), we obtain a cube (592704 = 84³).

The spelling of 645250 in words is "six hundred forty-five thousand, two hundred fifty".