645308925 has 12 divisors (see below), whose sum is σ = 1066910880. Its totient is φ = 344164720.

The previous prime is 645308921. The next prime is 645308941. The reversal of 645308925 is 529803546.

It is not a de Polignac number, because 645308925 - 2² = 645308921 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645308921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4301985 + ... + 4302134.

It is an arithmetic number, because the mean of its divisors is an integer number (88909240).

Almost surely, 2^645308925 is an apocalyptic number.

It is an amenable number.

645308925 is a deficient number, since it is larger than the sum of its proper divisors (421601955).

645308925 is a wasteful number, since it uses less digits than its factorization.

645308925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8604132 (or 8604127 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

The square root of 645308925 is about 25402.9314253296. The cubic root of 645308925 is about 864.1501783166.

The spelling of 645308925 in words is "six hundred forty-five million, three hundred eight thousand, nine hundred twenty-five".