669637068 has 48 divisors (see below), whose sum is σ = 1602478080. Its totient is φ = 217571200.

The previous prime is 669637049. The next prime is 669637069. The reversal of 669637068 is 860736966.

It is a self number, because there is not a number n which added to its sum of digits gives 669637068.

It is not an unprimeable number, because it can be changed into a prime (669637069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71413 + ... + 80243.

It is an arithmetic number, because the mean of its divisors is an integer number (33384960).

Almost surely, 2^669637068 is an apocalyptic number.

It is an amenable number.

669637068 is an abundant number, since it is smaller than the sum of its proper divisors (932841012).

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

669637068 is a wasteful number, since it uses less digits than its factorization.

669637068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8998 (or 8996 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 51.

The square root of 669637068 is about 25877.3466182296. The cubic root of 669637068 is about 874.8759848185.

The spelling of 669637068 in words is "six hundred sixty-nine million, six hundred thirty-seven thousand, sixty-eight".