645036 has 36 divisors (see below), whose sum is σ = 1752408. Its totient is φ = 184128.

The previous prime is 645023. The next prime is 645037. The reversal of 645036 is 630546.

It is a junction number, because it is equal to n+sod(n) for n = 644997 and 645015.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645036.

It is not an unprimeable number, because it can be changed into a prime (645037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40 + ... + 1136.

It is an arithmetic number, because the mean of its divisors is an integer number (48678).

2⁶⁴⁵⁰³⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (876204).

645036 is an abundant number, since it is smaller than the sum of its proper divisors (1107372).

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

645036 is a wasteful number, since it uses less digits than its factorization.

645036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118 (or 1109 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 645036 is about 803.1413325188. The cubic root of 645036 is about 86.4028334119.

The spelling of 645036 in words is "six hundred forty-five thousand, thirty-six".