664120827 has 12 divisors (see below), whose sum is σ = 1015714440. Its totient is φ = 416703168.

The previous prime is 664120777. The next prime is 664120867. The reversal of 664120827 is 728021466.

664120827 is a `hidden beast` number, since 6 + 641 + 2 + 0 + 8 + 2 + 7 = 666.

It is not a de Polignac number, because 664120827 - 2¹⁰ = 664119803 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664120791 and 664120800.

It is not an unprimeable number, because it can be changed into a prime (664120867) 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, 2170177 + ... + 2170482.

It is an arithmetic number, because the mean of its divisors is an integer number (84642870).

Almost surely, 2^664120827 is an apocalyptic number.

664120827 is a deficient number, since it is larger than the sum of its proper divisors (351593613).

664120827 is a wasteful number, since it uses less digits than its factorization.

664120827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4340682 (or 4340679 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 664120827 is about 25770.5418452930. The cubic root of 664120827 is about 872.4670483419.

The spelling of 664120827 in words is "six hundred sixty-four million, one hundred twenty thousand, eight hundred twenty-seven".