645925244 has 6 divisors (see below), whose sum is σ = 1130369184. Its totient is φ = 322962620.

The previous prime is 645925213. The next prime is 645925249. The reversal of 645925244 is 442529546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645925249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80740652 + ... + 80740659.

It is an arithmetic number, because the mean of its divisors is an integer number (188394864).

Almost surely, 2^645925244 is an apocalyptic number.

It is an amenable number.

645925244 is a deficient number, since it is larger than the sum of its proper divisors (484443940).

645925244 is a wasteful number, since it uses less digits than its factorization.

645925244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161481315 (or 161481313 counting only the distinct ones).

The product of its digits is 345600, while the sum is 41.

The square root of 645925244 is about 25415.0593939892. The cubic root of 645925244 is about 864.4252004482.

The spelling of 645925244 in words is "six hundred forty-five million, nine hundred twenty-five thousand, two hundred forty-four".