1988981568 has 280 divisors, whose sum is σ = 6859828800. Its totient is φ = 558047232.

The previous prime is 1988981567. The next prime is 1988981609. The reversal of 1988981568 is 8651898891.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988981567) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2140528 + ... + 2141456.

Almost surely, 2^1988981568 is an apocalyptic number.

1988981568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1988981568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3429914400).

1988981568 is an abundant number, since it is smaller than the sum of its proper divisors (4870847232).

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

1988981568 is an equidigital number, since it uses as much as digits as its factorization.

1988981568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019 (or 1000 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 63.

The square root of 1988981568 is about 44597.9995963945. Note that the first 3 decimals coincide. The cubic root of 1988981568 is about 1257.6030621684.

The spelling of 1988981568 in words is "one billion, nine hundred eighty-eight million, nine hundred eighty-one thousand, five hundred sixty-eight".