645549327 has 12 divisors (see below), whose sum is σ = 937852344. Its totient is φ = 427877520.

The previous prime is 645549283. The next prime is 645549329. The reversal of 645549327 is 723945546.

645549327 is a `hidden beast` number, since 6 + 4 + 554 + 93 + 2 + 7 = 666.

It is not a de Polignac number, because 645549327 - 2⁸ = 645549071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645549329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205749 + ... + 208862.

It is an arithmetic number, because the mean of its divisors is an integer number (78154362).

Almost surely, 2^645549327 is an apocalyptic number.

645549327 is a deficient number, since it is larger than the sum of its proper divisors (292303017).

645549327 is a wasteful number, since it uses less digits than its factorization.

645549327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414790 (or 414787 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 645549327 is about 25407.6627614584. The cubic root of 645549327 is about 864.2574745438.

The spelling of 645549327 in words is "six hundred forty-five million, five hundred forty-nine thousand, three hundred twenty-seven".