668701490 has 8 divisors (see below), whose sum is σ = 1203662700. Its totient is φ = 267480592.

The previous prime is 668701489. The next prime is 668701499. The reversal of 668701490 is 94107866.

It can be written as a sum of positive squares in 2 ways, for example, as 666827329 + 1874161 = 25823^2 + 1369^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (668701499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33435065 + ... + 33435084.

Almost surely, 2^668701490 is an apocalyptic number.

668701490 is a deficient number, since it is larger than the sum of its proper divisors (534961210).

668701490 is a wasteful number, since it uses less digits than its factorization.

668701490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66870156.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 668701490 is about 25859.2631372203. The cubic root of 668701490 is about 874.4683529568.

The spelling of 668701490 in words is "six hundred sixty-eight million, seven hundred one thousand, four hundred ninety".