645158 has 8 divisors (see below), whose sum is σ = 973200. Its totient is φ = 320760.

The previous prime is 645149. The next prime is 645179. The reversal of 645158 is 851546.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 645158.

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, 413 + ... + 1208.

It is an arithmetic number, because the mean of its divisors is an integer number (121650).

2⁶⁴⁵¹⁵⁸ is an apocalyptic number.

645158 is a deficient number, since it is larger than the sum of its proper divisors (328042).

645158 is a wasteful number, since it uses less digits than its factorization.

645158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822.

The product of its digits is 4800, while the sum is 29.

The square root of 645158 is about 803.2172806906. The cubic root of 645158 is about 86.4082803850.

The spelling of 645158 in words is "six hundred forty-five thousand, one hundred fifty-eight".