645535306 has 32 divisors (see below), whose sum is σ = 1065931776. Its totient is φ = 291384000.

The previous prime is 645535259. The next prime is 645535357. The reversal of 645535306 is 603535546.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 301861 + ... + 303991.

It is an arithmetic number, because the mean of its divisors is an integer number (33310368).

Almost surely, 2^645535306 is an apocalyptic number.

645535306 is a deficient number, since it is larger than the sum of its proper divisors (420396470).

645535306 is a wasteful number, since it uses less digits than its factorization.

645535306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398.

The product of its (nonzero) digits is 162000, while the sum is 37.

The square root of 645535306 is about 25407.3868392639. The cubic root of 645535306 is about 864.2512174223.

The spelling of 645535306 in words is "six hundred forty-five million, five hundred thirty-five thousand, three hundred six".