645076775 has 12 divisors (see below), whose sum is σ = 914166192. Its totient is φ = 442338240.

The previous prime is 645076753. The next prime is 645076787. The reversal of 645076775 is 577670546.

It is not a de Polignac number, because 645076775 - 2⁸ = 645076519 is a prime.

It is a super-2 number, since 2×645076775² = 832248091288801250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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, 1842902 + ... + 1843251.

It is an arithmetic number, because the mean of its divisors is an integer number (76180516).

Almost surely, 2^645076775 is an apocalyptic number.

645076775 is a deficient number, since it is larger than the sum of its proper divisors (269089417).

645076775 is a wasteful number, since it uses less digits than its factorization.

645076775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3686170 (or 3686165 counting only the distinct ones).

The product of its (nonzero) digits is 1234800, while the sum is 47.

The square root of 645076775 is about 25398.3616597607. The cubic root of 645076775 is about 864.0465398277.

The spelling of 645076775 in words is "six hundred forty-five million, seventy-six thousand, seven hundred seventy-five".