645068 has 6 divisors (see below), whose sum is σ = 1128876. Its totient is φ = 322532.

The previous prime is 645067. The next prime is 645077. The reversal of 645068 is 860546.

It is a super-2 number, since 2×645068² = 832225449248, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645068.

It is not an unprimeable number, because it can be changed into a prime (645067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80630 + ... + 80637.

It is an arithmetic number, because the mean of its divisors is an integer number (188146).

2⁶⁴⁵⁰⁶⁸ is an apocalyptic number.

It is an amenable number.

645068 is a deficient number, since it is larger than the sum of its proper divisors (483808).

645068 is a wasteful number, since it uses less digits than its factorization.

645068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161271 (or 161269 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 645068 is about 803.1612540455. The cubic root of 645068 is about 86.4042621926.

The spelling of 645068 in words is "six hundred forty-five thousand, sixty-eight".