687848421 has 24 divisors (see below), whose sum is σ = 997159680. Its totient is φ = 421564416.

The previous prime is 687848411. The next prime is 687848423. The reversal of 687848421 is 124848786.

It is not a de Polignac number, because 687848421 - 2¹¹ = 687846373 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687848423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127660 + ... + 132938.

It is an arithmetic number, because the mean of its divisors is an integer number (41548320).

Almost surely, 2^687848421 is an apocalyptic number.

It is an amenable number.

687848421 is a deficient number, since it is larger than the sum of its proper divisors (309311259).

687848421 is a wasteful number, since it uses less digits than its factorization.

687848421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5565 (or 5552 counting only the distinct ones).

The product of its digits is 688128, while the sum is 48.

The square root of 687848421 is about 26226.8644904419. The cubic root of 687848421 is about 882.7361553178.

The spelling of 687848421 in words is "six hundred eighty-seven million, eight hundred forty-eight thousand, four hundred twenty-one".