645425002 has 8 divisors (see below), whose sum is σ = 978118596. Its totient is φ = 319385472.

The previous prime is 645424999. The next prime is 645425017. The reversal of 645425002 is 200524546.

It can be written as a sum of positive squares in 2 ways, for example, as 632472201 + 12952801 = 25149^2 + 3599^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1663273 + ... + 1663660.

Almost surely, 2^645425002 is an apocalyptic number.

645425002 is a deficient number, since it is larger than the sum of its proper divisors (332693594).

645425002 is a wasteful number, since it uses less digits than its factorization.

645425002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3327032.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 645425002 is about 25405.2160392310. The cubic root of 645425002 is about 864.2019891329.

Adding to 645425002 its reverse (200524546), we get a palindrome (845949548).

The spelling of 645425002 in words is "six hundred forty-five million, four hundred twenty-five thousand, two".