648645 has 16 divisors (see below), whose sum is σ = 1052352. Its totient is φ = 341120.

The previous prime is 648631. The next prime is 648649. The reversal of 648645 is 546846.

It is a happy number.

It is not a de Polignac number, because 648645 - 2⁴ = 648629 is a prime.

It is a super-3 number, since 3×648645³ = 818733345782808375, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 985 + ... + 1505.

It is an arithmetic number, because the mean of its divisors is an integer number (65772).

2⁶⁴⁸⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

648645 is a deficient number, since it is larger than the sum of its proper divisors (403707).

648645 is a wasteful number, since it uses less digits than its factorization.

648645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612.

The product of its digits is 23040, while the sum is 33.

The square root of 648645 is about 805.3850011020. The cubic root of 648645 is about 86.5636761473.

The spelling of 648645 in words is "six hundred forty-eight thousand, six hundred forty-five".