645488 has 10 divisors (see below), whose sum is σ = 1250664. Its totient is φ = 322736.

The previous prime is 645481. The next prime is 645493. The reversal of 645488 is 884546.

645488 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20156 + ... + 20187.

2⁶⁴⁵⁴⁸⁸ is an apocalyptic number.

It is an amenable number.

645488 is a deficient number, since it is larger than the sum of its proper divisors (605176).

645488 is a wasteful number, since it uses less digits than its factorization.

645488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40351 (or 40345 counting only the distinct ones).

The product of its digits is 30720, while the sum is 35.

The square root of 645488 is about 803.4226782958. The cubic root of 645488 is about 86.4230105607.

The spelling of 645488 in words is "six hundred forty-five thousand, four hundred eighty-eight".