645093837 has 12 divisors (see below), whose sum is σ = 932022364. Its totient is φ = 429960960.

The previous prime is 645093803. The next prime is 645093851. The reversal of 645093837 is 738390546.

645093837 is a `hidden beast` number, since 64 + 509 + 3 + 83 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 138438756 + 506655081 = 11766^2 + 22509^2 .

It is a de Polignac number, because none of the positive numbers 2^k-645093837 is a prime.

It is a super-2 number, since 2×645093837² = 832292117070765138, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645093792 and 645093801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645093037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70887 + ... + 79467.

Almost surely, 2^645093837 is an apocalyptic number.

It is an amenable number.

645093837 is a deficient number, since it is larger than the sum of its proper divisors (286928527).

645093837 is a wasteful number, since it uses less digits than its factorization.

645093837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16940 (or 16937 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 645093837 is about 25398.6975453467. The cubic root of 645093837 is about 864.0541576456.

The spelling of 645093837 in words is "six hundred forty-five million, ninety-three thousand, eight hundred thirty-seven".