645027 has 8 divisors (see below), whose sum is σ = 864960. Its totient is φ = 427560.

The previous prime is 645023. The next prime is 645037. The reversal of 645027 is 720546.

It is a happy number.

645027 is nontrivially palindromic in base 15.

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

It is not a de Polignac number, because 645027 - 2² = 645023 is a prime.

645027 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 644988 and 645006.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645027.

It is not an unprimeable number, because it can be changed into a prime (645023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124 + ... + 1142.

It is an arithmetic number, because the mean of its divisors is an integer number (108120).

2⁶⁴⁵⁰²⁷ is an apocalyptic number.

645027 is a deficient number, since it is larger than the sum of its proper divisors (219933).

645027 is a wasteful number, since it uses less digits than its factorization.

645027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 645027 is about 803.1357295003. The cubic root of 645027 is about 86.4024315588.

The spelling of 645027 in words is "six hundred forty-five thousand, twenty-seven".