687173424 has 80 divisors (see below), whose sum is σ = 2034607872. Its totient is φ = 195773184.

The previous prime is 687173423. The next prime is 687173441. The reversal of 687173424 is 424371786.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (687173423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122587 + ... + 128069.

Almost surely, 2^687173424 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 687173424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1017303936).

687173424 is an abundant number, since it is smaller than the sum of its proper divisors (1347434448).

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

687173424 is a wasteful number, since it uses less digits than its factorization.

687173424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5874 (or 5868 counting only the distinct ones).

The product of its digits is 225792, while the sum is 42.

The square root of 687173424 is about 26213.9929045539. The cubic root of 687173424 is about 882.4473129660.

The spelling of 687173424 in words is "six hundred eighty-seven million, one hundred seventy-three thousand, four hundred twenty-four".