645490652 has 12 divisors (see below), whose sum is σ = 1129924320. Its totient is φ = 322655136.

The previous prime is 645490633. The next prime is 645490679. The reversal of 645490652 is 256094546.

It is a happy number.

It is a congruent number.

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, 4913 + ... + 36264.

It is an arithmetic number, because the mean of its divisors is an integer number (94160360).

Almost surely, 2^645490652 is an apocalyptic number.

It is an amenable number.

645490652 is a deficient number, since it is larger than the sum of its proper divisors (484433668).

645490652 is a wasteful number, since it uses less digits than its factorization.

645490652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45100 (or 45098 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 41.

The square root of 645490652 is about 25406.5080638800. The cubic root of 645490652 is about 864.2312891739.

The spelling of 645490652 in words is "six hundred forty-five million, four hundred ninety thousand, six hundred fifty-two".