645497106 has 48 divisors (see below), whose sum is σ = 1379289600. Its totient is φ = 201345280.

The previous prime is 645497101. The next prime is 645497117. The reversal of 645497106 is 601794546.

It is not an unprimeable number, because it can be changed into a prime (645497101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 330220 + ... + 332168.

It is an arithmetic number, because the mean of its divisors is an integer number (28735200).

Almost surely, 2^645497106 is an apocalyptic number.

645497106 is an abundant number, since it is smaller than the sum of its proper divisors (733792494).

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

645497106 is a wasteful number, since it uses less digits than its factorization.

645497106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2179 (or 2162 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 645497106 is about 25406.6350782625. The cubic root of 645497106 is about 864.2341695307.

The spelling of 645497106 in words is "six hundred forty-five million, four hundred ninety-seven thousand, one hundred six".