1687390362 has 72 divisors (see below), whose sum is σ = 4333276116. Its totient is φ = 473001984.

The previous prime is 1687390343. The next prime is 1687390363. The reversal of 1687390362 is 2630937861.

It can be written as a sum of positive squares in 2 ways, for example, as 1678622841 + 8767521 = 40971^2 + 2961^2 .

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1687390363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 28698 + ... + 64794.

Almost surely, 2^1687390362 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1687390362, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2166638058).

1687390362 is an abundant number, since it is smaller than the sum of its proper divisors (2645885754).

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

1687390362 is a wasteful number, since it uses less digits than its factorization.

1687390362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36172 (or 36162 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 1687390362 is about 41077.8573199723. The cubic root of 1687390362 is about 1190.5250047916.

The spelling of 1687390362 in words is "one billion, six hundred eighty-seven million, three hundred ninety thousand, three hundred sixty-two".