669740768 has 24 divisors (see below), whose sum is σ = 1332151632. Its totient is φ = 331416576.

The previous prime is 669740767. The next prime is 669740779. The reversal of 669740768 is 867047966.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669740767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104780 + ... + 110987.

It is an arithmetic number, because the mean of its divisors is an integer number (55506318).

Almost surely, 2^669740768 is an apocalyptic number.

It is an amenable number.

669740768 is a deficient number, since it is larger than the sum of its proper divisors (662410864).

669740768 is a wasteful number, since it uses less digits than its factorization.

669740768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215874 (or 215866 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 53.

The square root of 669740768 is about 25879.3502236822. The cubic root of 669740768 is about 874.9211435874.

The spelling of 669740768 in words is "six hundred sixty-nine million, seven hundred forty thousand, seven hundred sixty-eight".