1687396650 has 192 divisors, whose sum is σ = 4628275200. Its totient is φ = 405216000.

The previous prime is 1687396649. The next prime is 1687396651. The reversal of 1687396650 is 566937861.

It is an interprime number because it is at equal distance from previous prime (1687396649) and next prime (1687396651).

It is a junction number, because it is equal to n+sod(n) for n = 1687396593 and 1687396602.

It is not an unprimeable number, because it can be changed into a prime (1687396651) 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 95 ways as a sum of consecutive naturals, for example, 6272716 + ... + 6272984.

It is an arithmetic number, because the mean of its divisors is an integer number (24105600).

Almost surely, 2^1687396650 is an apocalyptic number.

1687396650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1687396650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2314137600).

1687396650 is an abundant number, since it is smaller than the sum of its proper divisors (2940878550).

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

1687396650 is a wasteful number, since it uses less digits than its factorization.

1687396650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 51.

The square root of 1687396650 is about 41077.9338574861. The cubic root of 1687396650 is about 1190.5264836061.

The spelling of 1687396650 in words is "one billion, six hundred eighty-seven million, three hundred ninety-six thousand, six hundred fifty".