1987780608 has 448 divisors, whose sum is σ = 6920179200. Its totient is φ = 557383680.

The previous prime is 1987780601. The next prime is 1987780621. The reversal of 1987780608 is 8060877891.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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 (1987780601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46227435 + ... + 46227477.

Almost surely, 2^1987780608 is an apocalyptic number.

1987780608 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 1987780608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3460089600).

1987780608 is an abundant number, since it is smaller than the sum of its proper divisors (4932398592).

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

1987780608 is a wasteful number, since it uses less digits than its factorization.

1987780608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 54.

The square root of 1987780608 is about 44584.5332822942. The cubic root of 1987780608 is about 1257.3498949056.

The spelling of 1987780608 in words is "one billion, nine hundred eighty-seven million, seven hundred eighty thousand, six hundred eight".