645594 has 8 divisors (see below), whose sum is σ = 1291200. Its totient is φ = 215196.

The previous prime is 645583. The next prime is 645599. The reversal of 645594 is 495546.

It is a sphenic number, since it is the product of 3 distinct primes.

645594 is an admirable number.

It is a super-2 number, since 2×645594² = 833583225672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645599) 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, 53794 + ... + 53805.

It is an arithmetic number, because the mean of its divisors is an integer number (161400).

2⁶⁴⁵⁵⁹⁴ is an apocalyptic number.

645594 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.

645594 is a wasteful number, since it uses less digits than its factorization.

645594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107604.

The product of its digits is 21600, while the sum is 33.

The square root of 645594 is about 803.4886433547. The cubic root of 645594 is about 86.4277410063.

The spelling of 645594 in words is "six hundred forty-five thousand, five hundred ninety-four".