664306842 has 64 divisors (see below), whose sum is σ = 1431360000. Its totient is φ = 204907968.

The previous prime is 664306837. The next prime is 664306847. The reversal of 664306842 is 248603466.

It is an interprime number because it is at equal distance from previous prime (664306837) and next prime (664306847).

It is a self number, because there is not a number n which added to its sum of digits gives 664306842.

It is not an unprimeable number, because it can be changed into a prime (664306847) 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 31 ways as a sum of consecutive naturals, for example, 1903284 + ... + 1903632.

It is an arithmetic number, because the mean of its divisors is an integer number (22365000).

Almost surely, 2^664306842 is an apocalyptic number.

664306842 is an abundant number, since it is smaller than the sum of its proper divisors (767053158).

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

664306842 is a wasteful number, since it uses less digits than its factorization.

664306842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715.

The product of its (nonzero) digits is 165888, while the sum is 39.

The square root of 664306842 is about 25774.1506552592. The cubic root of 664306842 is about 872.5484977818.

The spelling of 664306842 in words is "six hundred sixty-four million, three hundred six thousand, eight hundred forty-two".