668750029 has 8 divisors (see below), whose sum is σ = 709673400. Its totient is φ = 628002816.

The previous prime is 668750021. The next prime is 668750041. The reversal of 668750029 is 920057866.

It can be written as a sum of positive squares in 4 ways, for example, as 375313129 + 293436900 = 19373^2 + 17130^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 668750029 - 2³ = 668750021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668750021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36174 + ... + 51439.

It is an arithmetic number, because the mean of its divisors is an integer number (88709175).

Almost surely, 2^668750029 is an apocalyptic number.

It is an amenable number.

668750029 is a deficient number, since it is larger than the sum of its proper divisors (40923371).

668750029 is a wasteful number, since it uses less digits than its factorization.

668750029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88079.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 668750029 is about 25860.2016426787. The cubic root of 668750029 is about 874.4895107744.

The spelling of 668750029 in words is "six hundred sixty-eight million, seven hundred fifty thousand, twenty-nine".