687539492 has 24 divisors (see below), whose sum is σ = 1217866776. Its totient is φ = 339591168.

The previous prime is 687539473. The next prime is 687539539. The reversal of 687539492 is 294935786.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6120676 + 681418816 = 2474^2 + 26104^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259808 + ... + 262440.

It is an arithmetic number, because the mean of its divisors is an integer number (50744449).

Almost surely, 2^687539492 is an apocalyptic number.

It is an amenable number.

687539492 is a deficient number, since it is larger than the sum of its proper divisors (530327284).

687539492 is a wasteful number, since it uses less digits than its factorization.

687539492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3407 (or 3405 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 53.

The square root of 687539492 is about 26220.9742763308. The cubic root of 687539492 is about 882.6039829645.

The spelling of 687539492 in words is "six hundred eighty-seven million, five hundred thirty-nine thousand, four hundred ninety-two".