664242402 has 16 divisors (see below), whose sum is σ = 1329451200. Its totient is φ = 221253072.

The previous prime is 664242391. The next prime is 664242421. The reversal of 664242402 is 204242466.

664242402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×664242402² = 882435937229459208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 664242402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31173 + ... + 47960.

It is an arithmetic number, because the mean of its divisors is an integer number (83090700).

Almost surely, 2^664242402 is an apocalyptic number.

664242402 is an abundant number, since it is smaller than the sum of its proper divisors (665208798).

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

664242402 is a wasteful number, since it uses less digits than its factorization.

664242402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80537.

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 664242402 is about 25772.9005352521. The cubic root of 664242402 is about 872.5202834889.

Adding to 664242402 its reverse (204242466), we get a palindrome (868484868).

The spelling of 664242402 in words is "six hundred sixty-four million, two hundred forty-two thousand, four hundred two".