645735005 has 16 divisors (see below), whose sum is σ = 819659520. Its totient is φ = 487352448.

The previous prime is 645734983. The next prime is 645735017. The reversal of 645735005 is 500537546.

It is a cyclic number.

It is not a de Polignac number, because 645735005 - 2⁶ = 645734941 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30065 + ... + 46854.

It is an arithmetic number, because the mean of its divisors is an integer number (51228720).

Almost surely, 2^645735005 is an apocalyptic number.

It is an amenable number.

645735005 is a deficient number, since it is larger than the sum of its proper divisors (173924515).

645735005 is a wasteful number, since it uses less digits than its factorization.

645735005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77020.

The product of its (nonzero) digits is 63000, while the sum is 35.

The square root of 645735005 is about 25411.3164751455. The cubic root of 645735005 is about 864.3403281227.

The spelling of 645735005 in words is "six hundred forty-five million, seven hundred thirty-five thousand, five".