664006100 has 18 divisors (see below), whose sum is σ = 1440893454. Its totient is φ = 265602400.

The previous prime is 664006051. The next prime is 664006103. The reversal of 664006100 is 1600466.

It can be written as a sum of positive squares in 3 ways, for example, as 8031556 + 655974544 = 2834^2 + 25612^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664006103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3319931 + ... + 3320130.

Almost surely, 2^664006100 is an apocalyptic number.

It is an amenable number.

664006100 is an abundant number, since it is smaller than the sum of its proper divisors (776887354).

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

664006100 is a wasteful number, since it uses less digits than its factorization.

664006100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6640075 (or 6640068 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 664006100 is about 25768.3158161336. The cubic root of 664006100 is about 872.4168058321.

Adding to 664006100 its reverse (1600466), we get a palindrome (665606566).

The spelling of 664006100 in words is "six hundred sixty-four million, six thousand, one hundred".