668899750 has 64 divisors (see below), whose sum is σ = 1343459520. Its totient is φ = 248601600.

The previous prime is 668899691. The next prime is 668899757. The reversal of 668899750 is 57998866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668899757) 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, 250422 + ... + 253078.

It is an arithmetic number, because the mean of its divisors is an integer number (20991555).

Almost surely, 2^668899750 is an apocalyptic number.

668899750 is an abundant number, since it is smaller than the sum of its proper divisors (674559770).

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

668899750 is a wasteful number, since it uses less digits than its factorization.

668899750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746 (or 2736 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 58.

The square root of 668899750 is about 25863.0962956874. The cubic root of 668899750 is about 874.5547666840.

The spelling of 668899750 in words is "six hundred sixty-eight million, eight hundred ninety-nine thousand, seven hundred fifty".