1687398804 has 168 divisors, whose sum is σ = 5449960320. Its totient is φ = 444958272.

The previous prime is 1687398799. The next prime is 1687398821. The reversal of 1687398804 is 4088937861.

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 polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 262177 + ... + 268535.

It is an arithmetic number, because the mean of its divisors is an integer number (32440240).

Almost surely, 2^1687398804 is an apocalyptic number.

1687398804 is a gapful number since it is divisible by the number (14) 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 1687398804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2724980160).

1687398804 is an abundant number, since it is smaller than the sum of its proper divisors (3762561516).

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

1687398804 is a wasteful number, since it uses less digits than its factorization.

1687398804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6401 (or 6384 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The square root of 1687398804 is about 41077.9600759337. The cubic root of 1687398804 is about 1190.5269901839.

The spelling of 1687398804 in words is "one billion, six hundred eighty-seven million, three hundred ninety-eight thousand, eight hundred four".