687287493 has 12 divisors (see below), whose sum is σ = 997790508. Its totient is φ = 455864640.

The previous prime is 687287479. The next prime is 687287521. The reversal of 687287493 is 394782786.

687287493 is a `hidden beast` number, since 6 + 8 + 72 + 87 + 493 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 395492769 + 291794724 = 19887^2 + 17082^2 .

It is not a de Polignac number, because 687287493 - 2¹³ = 687279301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687287423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192048 + ... + 195593.

It is an arithmetic number, because the mean of its divisors is an integer number (83149209).

Almost surely, 2^687287493 is an apocalyptic number.

It is an amenable number.

687287493 is a deficient number, since it is larger than the sum of its proper divisors (310503015).

687287493 is a wasteful number, since it uses less digits than its factorization.

687287493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387844 (or 387841 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The square root of 687287493 is about 26216.1685415699. The cubic root of 687287493 is about 882.4961382503.

The spelling of 687287493 in words is "six hundred eighty-seven million, two hundred eighty-seven thousand, four hundred ninety-three".