645512 has 16 divisors (see below), whose sum is σ = 1383360. Its totient is φ = 276624.

The previous prime is 645503. The next prime is 645521. The reversal of 645512 is 215546.

It is an interprime number because it is at equal distance from previous prime (645503) and next prime (645521).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645512.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5708 + ... + 5819.

It is an arithmetic number, because the mean of its divisors is an integer number (86460).

2⁶⁴⁵⁵¹² is an apocalyptic number.

It is an amenable number.

645512 is an abundant number, since it is smaller than the sum of its proper divisors (737848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645512 is a wasteful number, since it uses less digits than its factorization.

645512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11540 (or 11536 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 645512 is about 803.4376142551. The cubic root of 645512 is about 86.4240816503.

The spelling of 645512 in words is "six hundred forty-five thousand, five hundred twelve".