687285492 has 12 divisors (see below), whose sum is σ = 1603666176. Its totient is φ = 229095160.

The previous prime is 687285491. The next prime is 687285509. The reversal of 687285492 is 294582786.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×687285492² = 944722695027364128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687285491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28636884 + ... + 28636907.

It is an arithmetic number, because the mean of its divisors is an integer number (133638848).

Almost surely, 2^687285492 is an apocalyptic number.

It is an amenable number.

687285492 is an abundant number, since it is smaller than the sum of its proper divisors (916380684).

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

687285492 is a wasteful number, since it uses less digits than its factorization.

687285492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57273798 (or 57273796 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

The square root of 687285492 is about 26216.1303780707. The cubic root of 687285492 is about 882.4952818030.

The spelling of 687285492 in words is "six hundred eighty-seven million, two hundred eighty-five thousand, four hundred ninety-two".