1987744880 has 80 divisors (see below), whose sum is σ = 5070211200. Its totient is φ = 718721280.

The previous prime is 1987744879. The next prime is 1987744909. The reversal of 1987744880 is 884477891.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1987744880² = 7902259415932428800, which contains 22 as substring.

It is a congruent number.

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, 151211 + ... + 163829.

It is an arithmetic number, because the mean of its divisors is an integer number (63377640).

Almost surely, 2^1987744880 is an apocalyptic number.

1987744880 is a gapful number since it is divisible by the number (10) 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 1987744880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2535105600).

1987744880 is an abundant number, since it is smaller than the sum of its proper divisors (3082466320).

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

1987744880 is a wasteful number, since it uses less digits than its factorization.

1987744880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12822 (or 12816 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 56.

The square root of 1987744880 is about 44584.1326034274. The cubic root of 1987744880 is about 1257.3423617358.

The spelling of 1987744880 in words is "one billion, nine hundred eighty-seven million, seven hundred forty-four thousand, eight hundred eighty".