645372610 has 8 divisors (see below), whose sum is σ = 1161670716. Its totient is φ = 258149040.

The previous prime is 645372593. The next prime is 645372631. The reversal of 645372610 is 16273546.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 615089601 + 30283009 = 24801^2 + 5503^2 .

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, 32268621 + ... + 32268640.

Almost surely, 2^645372610 is an apocalyptic number.

645372610 is a deficient number, since it is larger than the sum of its proper divisors (516298106).

645372610 is a wasteful number, since it uses less digits than its factorization.

645372610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64537268.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 645372610 is about 25404.1848914701. The cubic root of 645372610 is about 864.1786048018.

The spelling of 645372610 in words is "six hundred forty-five million, three hundred seventy-two thousand, six hundred ten".