1988385668 has 48 divisors (see below), whose sum is σ = 3609748800. Its totient is φ = 957918720.

The previous prime is 1988385643. The next prime is 1988385677. The reversal of 1988385668 is 8665838891.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1988385668.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2877203 + ... + 2877893.

It is an arithmetic number, because the mean of its divisors is an integer number (75203100).

Almost surely, 2^1988385668 is an apocalyptic number.

It is an amenable number.

1988385668 is a deficient number, since it is larger than the sum of its proper divisors (1621363132).

1988385668 is a wasteful number, since it uses less digits than its factorization.

1988385668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980 (or 978 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 62.

The square root of 1988385668 is about 44591.3183030060. The cubic root of 1988385668 is about 1257.4774567614.

The spelling of 1988385668 in words is "one billion, nine hundred eighty-eight million, three hundred eighty-five thousand, six hundred sixty-eight".