664371027 has 24 divisors (see below), whose sum is σ = 993049200. Its totient is φ = 427730688.

The previous prime is 664370989. The next prime is 664371047. The reversal of 664371027 is 720173466.

664371027 is a `hidden beast` number, since 6 + 643 + 7 + 1 + 0 + 2 + 7 = 666.

It is not a de Polignac number, because 664371027 - 2¹⁸ = 664108883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664370982 and 664371000.

It is not an unprimeable number, because it can be changed into a prime (664371047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24799 + ... + 44087.

It is an arithmetic number, because the mean of its divisors is an integer number (41377050).

Almost surely, 2^664371027 is an apocalyptic number.

664371027 is a deficient number, since it is larger than the sum of its proper divisors (328678173).

664371027 is a wasteful number, since it uses less digits than its factorization.

664371027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19427 (or 19424 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 664371027 is about 25775.3957680576. The cubic root of 664371027 is about 872.5765986122.

The spelling of 664371027 in words is "six hundred sixty-four million, three hundred seventy-one thousand, twenty-seven".