1668687588 has 24 divisors (see below), whose sum is σ = 4326227360. Its totient is φ = 556229160.

The previous prime is 1668687571. The next prime is 1668687607. The reversal of 1668687588 is 8857868661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7725298 + ... + 7725513.

Almost surely, 2^1668687588 is an apocalyptic number.

1668687588 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1668687588 is an abundant number, since it is smaller than the sum of its proper divisors (2657539772).

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

1668687588 is a wasteful number, since it uses less digits than its factorization.

1668687588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15450824 (or 15450816 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 63.

The square root of 1668687588 is about 40849.5726783035. The cubic root of 1668687588 is about 1186.1101213738.

The spelling of 1668687588 in words is "one billion, six hundred sixty-eight million, six hundred eighty-seven thousand, five hundred eighty-eight".