645610652 has 24 divisors (see below), whose sum is σ = 1191195600. Its totient is φ = 305323776.

The previous prime is 645610631. The next prime is 645610661. The reversal of 645610652 is 256016546.

It is a super-2 number, since 2×645610652² = 833626227951730208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43124 + ... + 56132.

It is an arithmetic number, because the mean of its divisors is an integer number (49633150).

Almost surely, 2^645610652 is an apocalyptic number.

It is an amenable number.

645610652 is a deficient number, since it is larger than the sum of its proper divisors (545584948).

645610652 is a wasteful number, since it uses less digits than its factorization.

645610652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13685 (or 13683 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 645610652 is about 25408.8695537602. The cubic root of 645610652 is about 864.2848408550.

The spelling of 645610652 in words is "six hundred forty-five million, six hundred ten thousand, six hundred fifty-two".