645316 has 24 divisors (see below), whose sum is σ = 1359680. Its totient is φ = 261792.

The previous prime is 645313. The next prime is 645329. The reversal of 645316 is 613546.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (645313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75 + ... + 1138.

2⁶⁴⁵³¹⁶ is an apocalyptic number.

It is an amenable number.

645316 is an abundant number, since it is smaller than the sum of its proper divisors (714364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645316 is a wasteful number, since it uses less digits than its factorization.

645316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243 (or 1241 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 645316 is about 803.3156291272. The cubic root of 645316 is about 86.4153336411.

It can be divided in two parts, 645 and 316, that added together give a square (961 = 31²).

The spelling of 645316 in words is "six hundred forty-five thousand, three hundred sixteen".