645464277 has 12 divisors (see below), whose sum is σ = 935781184. Its totient is φ = 428720040.

The previous prime is 645464251. The next prime is 645464311. The reversal of 645464277 is 772464546.

645464277 is a `hidden beast` number, since 64 + 546 + 42 + 7 + 7 = 666.

It is not a de Polignac number, because 645464277 - 2⁶ = 645464213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645464077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129883 + ... + 134760.

Almost surely, 2^645464277 is an apocalyptic number.

It is an amenable number.

645464277 is a deficient number, since it is larger than the sum of its proper divisors (290316907).

645464277 is a wasteful number, since it uses less digits than its factorization.

645464277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264920 (or 264917 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 45.

The square root of 645464277 is about 25405.9889986594. The cubic root of 645464277 is about 864.2195180709.

The spelling of 645464277 in words is "six hundred forty-five million, four hundred sixty-four thousand, two hundred seventy-seven".