645652 has 12 divisors (see below), whose sum is σ = 1291360. Its totient is φ = 276696.

The previous prime is 645649. The next prime is 645661. The reversal of 645652 is 256546.

645652 is an admirable number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 23059 = 645652 / (6 + 4 + 5 + 6 + 5 + 2).

It is a self number, because there is not a number n which added to its sum of digits gives 645652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11502 + ... + 11557.

2⁶⁴⁵⁶⁵² is an apocalyptic number.

It is an amenable number.

645652 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

645652 is a wasteful number, since it uses less digits than its factorization.

645652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23070 (or 23068 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 645652 is about 803.5247351513. The cubic root of 645652 is about 86.4303291442.

The spelling of 645652 in words is "six hundred forty-five thousand, six hundred fifty-two".