664002042 has 64 divisors (see below), whose sum is σ = 1516769280. Its totient is φ = 191822400.

The previous prime is 664002023. The next prime is 664002043. The reversal of 664002042 is 240200466.

It is not an unprimeable number, because it can be changed into a prime (664002043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 638559 + ... + 639597.

It is an arithmetic number, because the mean of its divisors is an integer number (23699520).

Almost surely, 2^664002042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664002042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (758384640).

664002042 is an abundant number, since it is smaller than the sum of its proper divisors (852767238).

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

664002042 is a wasteful number, since it uses less digits than its factorization.

664002042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 664002042 is about 25768.2370759041. The cubic root of 664002042 is about 872.4150286021.

The spelling of 664002042 in words is "six hundred sixty-four million, two thousand, forty-two".