645094 has 8 divisors (see below), whose sum is σ = 991368. Its totient is φ = 314640.

The previous prime is 645091. The next prime is 645097. The reversal of 645094 is 490546.

645094 is nontrivially palindromic in base 9.

It is an interprime number because it is at equal distance from previous prime (645091) and next prime (645097).

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

It is a super-2 number, since 2×645094² = 832292537672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3852 + ... + 4015.

It is an arithmetic number, because the mean of its divisors is an integer number (123921).

2⁶⁴⁵⁰⁹⁴ is an apocalyptic number.

645094 is a deficient number, since it is larger than the sum of its proper divisors (346274).

645094 is a wasteful number, since it uses less digits than its factorization.

645094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7910.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 645094 is about 803.1774399222. The cubic root of 645094 is about 86.4054230421.

The spelling of 645094 in words is "six hundred forty-five thousand, ninety-four".