645442202 has 8 divisors (see below), whose sum is σ = 981426036. Its totient is φ = 318300192.

The previous prime is 645442181. The next prime is 645442219. The reversal of 645442202 is 202244546.

645442202 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 597264721 + 48177481 = 24439^2 + 6941^2 .

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

It is a super-2 number, since 2×645442202² = 833191272245217608, which contains 22 as substring.

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, 2210273 + ... + 2210564.

Almost surely, 2^645442202 is an apocalyptic number.

645442202 is a deficient number, since it is larger than the sum of its proper divisors (335983834).

645442202 is a wasteful number, since it uses less digits than its factorization.

645442202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4420912.

The product of its (nonzero) digits is 15360, while the sum is 29.

The square root of 645442202 is about 25405.5545501373. The cubic root of 645442202 is about 864.2096658018.

Adding to 645442202 its reverse (202244546), we get a palindrome (847686748).

The spelling of 645442202 in words is "six hundred forty-five million, four hundred forty-two thousand, two hundred two".