645154 has 8 divisors (see below), whose sum is σ = 974160. Its totient is φ = 320436.

The previous prime is 645149. The next prime is 645179. The reversal of 645154 is 451546.

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

It is a super-3 number, since 3×645154³ = 805585123332336792, which contains 333 as substring.

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, 664 + ... + 1315.

It is an arithmetic number, because the mean of its divisors is an integer number (121770).

2⁶⁴⁵¹⁵⁴ is an apocalyptic number.

645154 is a deficient number, since it is larger than the sum of its proper divisors (329006).

645154 is a wasteful number, since it uses less digits than its factorization.

645154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144.

The product of its digits is 2400, while the sum is 25.

The square root of 645154 is about 803.2147907005. The cubic root of 645154 is about 86.4081018066.

The spelling of 645154 in words is "six hundred forty-five thousand, one hundred fifty-four".