687487842 has 24 divisors (see below), whose sum is σ = 1497125916. Its totient is φ = 227998176.

The previous prime is 687487841. The next prime is 687487897. The reversal of 687487842 is 248784786.

It is a happy number.

687487842 is a `hidden beast` number, since 6 + 87 + 487 + 84 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 444408561 + 243079281 = 21081^2 + 15591^2 .

It is not an unprimeable number, because it can be changed into a prime (687487841) 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, 93393 + ... + 100484.

Almost surely, 2^687487842 is an apocalyptic number.

687487842 is an abundant number, since it is smaller than the sum of its proper divisors (809638074).

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

687487842 is a wasteful number, since it uses less digits than its factorization.

687487842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194082 (or 194079 counting only the distinct ones).

The product of its digits is 4816896, while the sum is 54.

The square root of 687487842 is about 26219.9893592656. The cubic root of 687487842 is about 882.5818811372.

The spelling of 687487842 in words is "six hundred eighty-seven million, four hundred eighty-seven thousand, eight hundred forty-two".