669371688 has 48 divisors (see below), whose sum is σ = 1880030880. Its totient is φ = 223123248.

The previous prime is 669371687. The next prime is 669371771. The reversal of 669371688 is 886173966.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (669371687) 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, 170220 + ... + 174107.

It is an arithmetic number, because the mean of its divisors is an integer number (39167310).

Almost surely, 2^669371688 is an apocalyptic number.

It is an amenable number.

669371688 is an abundant number, since it is smaller than the sum of its proper divisors (1210659192).

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

669371688 is a wasteful number, since it uses less digits than its factorization.

669371688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344348 (or 344332 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 669371688 is about 25872.2184591890. The cubic root of 669371688 is about 874.7603971978.

The spelling of 669371688 in words is "six hundred sixty-nine million, three hundred seventy-one thousand, six hundred eighty-eight".