1987819704 has 224 divisors, whose sum is σ = 6092644320. Its totient is φ = 604101888.

The previous prime is 1987819697. The next prime is 1987819723. The reversal of 1987819704 is 4079187891.

It is a super-2 number, since 2×1987819704² = 7902854351221295232, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 11903029 + ... + 11903195.

It is an arithmetic number, because the mean of its divisors is an integer number (27199305).

Almost surely, 2^1987819704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1987819704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3046322160).

1987819704 is an abundant number, since it is smaller than the sum of its proper divisors (4104824616).

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

1987819704 is a wasteful number, since it uses less digits than its factorization.

1987819704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 54.

The square root of 1987819704 is about 44584.9717281507. The cubic root of 1987819704 is about 1257.3581381072.

The spelling of 1987819704 in words is "one billion, nine hundred eighty-seven million, eight hundred nineteen thousand, seven hundred four".