1988644608 has 180 divisors, whose sum is σ = 6136108440. Its totient is φ = 639830016.

The previous prime is 1988644601. The next prime is 1988644667. The reversal of 1988644608 is 8064468891.

1988644608 is a `hidden beast` number, since 198 + 8 + 6 + 446 + 0 + 8 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988644601) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 599691 + ... + 602997.

Almost surely, 2^1988644608 is an apocalyptic number.

1988644608 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 1988644608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3068054220).

1988644608 is an abundant number, since it is smaller than the sum of its proper divisors (4147463832).

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

1988644608 is an equidigital number, since it uses as much as digits as its factorization.

1988644608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3364 (or 3341 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 54.

The square root of 1988644608 is about 44594.2216884654. The cubic root of 1988644608 is about 1257.5320399147.

The spelling of 1988644608 in words is "one billion, nine hundred eighty-eight million, six hundred forty-four thousand, six hundred eight".