645008359 has 4 divisors (see below), whose sum is σ = 645233904. Its totient is φ = 644782816.

The previous prime is 645008341. The next prime is 645008369. The reversal of 645008359 is 953800546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645008359 - 2²¹ = 642911207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645008369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108427 + ... + 114220.

It is an arithmetic number, because the mean of its divisors is an integer number (161308476).

Almost surely, 2^645008359 is an apocalyptic number.

645008359 is a deficient number, since it is larger than the sum of its proper divisors (225545).

645008359 is a wasteful number, since it uses less digits than its factorization.

645008359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225544.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 645008359 is about 25397.0147655192. The cubic root of 645008359 is about 864.0159921987.

The spelling of 645008359 in words is "six hundred forty-five million, eight thousand, three hundred fifty-nine".