668734900 has 36 divisors (see below), whose sum is σ = 1452844512. Its totient is φ = 267182560.

The previous prime is 668734873. The next prime is 668734907. The reversal of 668734900 is 9437866.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668734907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94899 + ... + 101701.

It is an arithmetic number, because the mean of its divisors is an integer number (40356792).

Almost surely, 2^668734900 is an apocalyptic number.

It is an amenable number.

668734900 is an abundant number, since it is smaller than the sum of its proper divisors (784109612).

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

668734900 is a wasteful number, since it uses less digits than its factorization.

668734900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7800 (or 7793 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 668734900 is about 25859.9091259037. The cubic root of 668734900 is about 874.4829162568.

The spelling of 668734900 in words is "six hundred sixty-eight million, seven hundred thirty-four thousand, nine hundred".