645196 has 12 divisors (see below), whose sum is σ = 1178352. Its totient is φ = 308528.

The previous prime is 645187. The next prime is 645233. The reversal of 645196 is 691546.

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, 3415 + ... + 3598.

It is an arithmetic number, because the mean of its divisors is an integer number (98196).

2⁶⁴⁵¹⁹⁶ is an apocalyptic number.

It is an amenable number.

645196 is a deficient number, since it is larger than the sum of its proper divisors (533156).

645196 is a wasteful number, since it uses less digits than its factorization.

645196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7040 (or 7038 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 645196 is about 803.2409352118. The cubic root of 645196 is about 86.4099768429.

It can be divided in two parts, 645 and 196, that added together give a square (841 = 29²).

The spelling of 645196 in words is "six hundred forty-five thousand, one hundred ninety-six".