664271084 has 24 divisors (see below), whose sum is σ = 1225887600. Its totient is φ = 314081280.

The previous prime is 664271081. The next prime is 664271099. The reversal of 664271084 is 480172466.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (664271081) 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 7 ways as a sum of consecutive naturals, for example, 35564 + ... + 50924.

It is an arithmetic number, because the mean of its divisors is an integer number (51078650).

Almost surely, 2^664271084 is an apocalyptic number.

It is an amenable number.

664271084 is a deficient number, since it is larger than the sum of its proper divisors (561616516).

664271084 is a wasteful number, since it uses less digits than its factorization.

664271084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15953 (or 15951 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 664271084 is about 25773.4569664219. The cubic root of 664271084 is about 872.5328417892.

The spelling of 664271084 in words is "six hundred sixty-four million, two hundred seventy-one thousand, eighty-four".