645204002 has 8 divisors (see below), whose sum is σ = 993963036. Its totient is φ = 313882992.

The previous prime is 645203963. The next prime is 645204017. The reversal of 645204002 is 200402546.

It can be written as a sum of positive squares in 2 ways, for example, as 526197721 + 119006281 = 22939^2 + 10909^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 4359413 + ... + 4359560.

Almost surely, 2^645204002 is an apocalyptic number.

645204002 is a deficient number, since it is larger than the sum of its proper divisors (348759034).

645204002 is a wasteful number, since it uses less digits than its factorization.

645204002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8719012.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 645204002 is about 25400.8661663338. The cubic root of 645204002 is about 864.1033407270.

Adding to 645204002 its reverse (200402546), we get a palindrome (845606548).

The spelling of 645204002 in words is "six hundred forty-five million, two hundred four thousand, two".