645094854 has 20 divisors (see below), whose sum is σ = 1445490684. Its totient is φ = 215031564.

The previous prime is 645094843. The next prime is 645094867. The reversal of 645094854 is 458490546.

645094854 is a `hidden beast` number, since 64 + 509 + 4 + 85 + 4 = 666.

It is a super-2 number, since 2×645094854² = 832294741314562632, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 1990872 + ... + 1991195.

Almost surely, 2^645094854 is an apocalyptic number.

645094854 is an abundant number, since it is smaller than the sum of its proper divisors (800395830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645094854 is a wasteful number, since it uses less digits than its factorization.

645094854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3982081 (or 3982072 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The square root of 645094854 is about 25398.7175660505. The cubic root of 645094854 is about 864.0546117101.

The spelling of 645094854 in words is "six hundred forty-five million, ninety-four thousand, eight hundred fifty-four".