645124 has 6 divisors (see below), whose sum is σ = 1128974.
Its totient is φ = 322560.
The previous prime is 645097. The next prime is 645131. The reversal of 645124 is 421546.
It can be written as a sum of positive squares in only one way, i.e., 515524 + 129600 = 718^2 + 360^2
It is a junction number, because it is equal to n+sod(n) for n = 645095 and 645104.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80637 + ... + 80644.
2645124 is an apocalyptic number.
It is an amenable number.
645124 is a deficient number, since it is larger than the sum of its proper divisors (483850).
645124 is a wasteful number, since it uses less digits than its factorization.
645124 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 161285 (or 161283 counting only the distinct ones).
The product of its digits is 960, while the sum is 22.
The square root of 645124 is about 803.1961155285.
The cubic root of 645124 is about 86.4067624451.
It can be divided in two parts, 64512 and 4, that added together give a square (64516 = 2542).
The spelling of 645124 in words is "six hundred forty-five thousand, one hundred twenty-four".