687074520 has 128 divisors (see below), whose sum is σ = 2259498240. Its totient is φ = 165757440.

The previous prime is 687074501. The next prime is 687074527. The reversal of 687074520 is 25470786.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687074527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 298494 + ... + 300786.

It is an arithmetic number, because the mean of its divisors is an integer number (17652330).

Almost surely, 2^687074520 is an apocalyptic number.

687074520 is a gapful number since it is divisible by the number (60) 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 687074520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1129749120).

687074520 is an abundant number, since it is smaller than the sum of its proper divisors (1572423720).

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

687074520 is a wasteful number, since it uses less digits than its factorization.

687074520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545 (or 2541 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 687074520 is about 26212.1063632818. The cubic root of 687074520 is about 882.4049744269.

The spelling of 687074520 in words is "six hundred eighty-seven million, seventy-four thousand, five hundred twenty".