664059940 has 12 divisors (see below), whose sum is σ = 1394525916. Its totient is φ = 265623968.

The previous prime is 664059931. The next prime is 664059943. The reversal of 664059940 is 49950466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 108326464 + 555733476 = 10408^2 + 23574^2 .

It is not an unprimeable number, because it can be changed into a prime (664059943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16601479 + ... + 16601518.

It is an arithmetic number, because the mean of its divisors is an integer number (116210493).

Almost surely, 2^664059940 is an apocalyptic number.

It is an amenable number.

664059940 is an abundant number, since it is smaller than the sum of its proper divisors (730465976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664059940 is a wasteful number, since it uses less digits than its factorization.

664059940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33203006 (or 33203004 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 664059940 is about 25769.3604887665. The cubic root of 664059940 is about 872.4403847577.

The spelling of 664059940 in words is "six hundred sixty-four million, fifty-nine thousand, nine hundred forty".