645007475 has 24 divisors (see below), whose sum is σ = 924360480. Its totient is φ = 437310720.

The previous prime is 645007471. The next prime is 645007477. The reversal of 645007475 is 574700546.

It is not a de Polignac number, because 645007475 - 2² = 645007471 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645007471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5132 + ... + 36281.

It is an arithmetic number, because the mean of its divisors is an integer number (38515020).

Almost surely, 2^645007475 is an apocalyptic number.

645007475 is a deficient number, since it is larger than the sum of its proper divisors (279353005).

645007475 is a wasteful number, since it uses less digits than its factorization.

645007475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41519 (or 41514 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 38.

The square root of 645007475 is about 25396.9973618930. The cubic root of 645007475 is about 864.0155974801.

The spelling of 645007475 in words is "six hundred forty-five million, seven thousand, four hundred seventy-five".