645093836 has 36 divisors (see below), whose sum is σ = 1165382064. Its totient is φ = 312439680.

The previous prime is 645093803. The next prime is 645093851. The reversal of 645093836 is 638390546.

It is a super-2 number, since 2×645093836² = 832292114490389792, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1324385 + ... + 1324871.

It is an arithmetic number, because the mean of its divisors is an integer number (32371724).

Almost surely, 2^645093836 is an apocalyptic number.

It is an amenable number.

645093836 is a deficient number, since it is larger than the sum of its proper divisors (520288228).

645093836 is a wasteful number, since it uses less digits than its factorization.

645093836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770 (or 727 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 44.

The square root of 645093836 is about 25398.6975256606. The cubic root of 645093836 is about 864.0541571991.

The spelling of 645093836 in words is "six hundred forty-five million, ninety-three thousand, eight hundred thirty-six".