645055306 has 24 divisors (see below), whose sum is σ = 1141420896. Its totient is φ = 272555640.

The previous prime is 645055291. The next prime is 645055331. The reversal of 645055306 is 603550546.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39396 + ... + 53311.

It is an arithmetic number, because the mean of its divisors is an integer number (47559204).

Almost surely, 2^645055306 is an apocalyptic number.

645055306 is a deficient number, since it is larger than the sum of its proper divisors (496365590).

645055306 is a wasteful number, since it uses less digits than its factorization.

645055306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92794 (or 92787 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 34.

The square root of 645055306 is about 25397.9390108725. The cubic root of 645055306 is about 864.0369541879.

The spelling of 645055306 in words is "six hundred forty-five million, fifty-five thousand, three hundred six".