645348586 has 8 divisors (see below), whose sum is σ = 968185764. Its totient is φ = 322620000.

The previous prime is 645348553. The next prime is 645348589. The reversal of 645348586 is 685843546.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 624050361 + 21298225 = 24981^2 + 4615^2 .

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

It is not an unprimeable number, because it can be changed into a prime (645348589) 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, 10165 + ... + 37336.

Almost surely, 2^645348586 is an apocalyptic number.

645348586 is a deficient number, since it is larger than the sum of its proper divisors (322837178).

645348586 is a wasteful number, since it uses less digits than its factorization.

645348586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54296.

The product of its digits is 2764800, while the sum is 49.

The square root of 645348586 is about 25403.7120515881. The cubic root of 645348586 is about 864.1678816505.

The spelling of 645348586 in words is "six hundred forty-five million, three hundred forty-eight thousand, five hundred eighty-six".