645358 has 16 divisors (see below), whose sum is σ = 1142784. Its totient is φ = 267480.

The previous prime is 645353. The next prime is 645367. The reversal of 645358 is 853546.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645353) by changing a digit.

645358 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 310 + ... + 1177.

It is an arithmetic number, because the mean of its divisors is an integer number (71424).

2⁶⁴⁵³⁵⁸ is an apocalyptic number.

645358 is a deficient number, since it is larger than the sum of its proper divisors (497426).

645358 is a wasteful number, since it uses less digits than its factorization.

645358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527.

The product of its digits is 14400, while the sum is 31.

The square root of 645358 is about 803.3417703568. The cubic root of 645358 is about 86.4172083636.

The spelling of 645358 in words is "six hundred forty-five thousand, three hundred fifty-eight".