645277827 has 16 divisors (see below), whose sum is σ = 865085312. Its totient is φ = 427835520.

The previous prime is 645277807. The next prime is 645277837. The reversal of 645277827 is 728772546.

It is not a de Polignac number, because 645277827 - 2¹¹ = 645275779 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645277807) 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 15 ways as a sum of consecutive naturals, for example, 795252 + ... + 796062.

It is an arithmetic number, because the mean of its divisors is an integer number (54067832).

Almost surely, 2^645277827 is an apocalyptic number.

645277827 is a deficient number, since it is larger than the sum of its proper divisors (219807485).

645277827 is a wasteful number, since it uses less digits than its factorization.

645277827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1938.

The product of its digits is 1317120, while the sum is 48.

The square root of 645277827 is about 25402.3193232429. The cubic root of 645277827 is about 864.1362967100.

The spelling of 645277827 in words is "six hundred forty-five million, two hundred seventy-seven thousand, eight hundred twenty-seven".