687401536 has 28 divisors (see below), whose sum is σ = 1366016572. Its totient is φ = 343208448.

The previous prime is 687401509. The next prime is 687401543. The reversal of 687401536 is 635104786.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 627803136 + 59598400 = 25056^2 + 7720^2 .

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 3 ways as a sum of consecutive naturals, for example, 39586 + ... + 54238.

Almost surely, 2^687401536 is an apocalyptic number.

It is an amenable number.

687401536 is a deficient number, since it is larger than the sum of its proper divisors (678615036).

687401536 is a wasteful number, since it uses less digits than its factorization.

687401536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15398 (or 15388 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 687401536 is about 26218.3435022123. The cubic root of 687401536 is about 882.5449470055.

The spelling of 687401536 in words is "six hundred eighty-seven million, four hundred one thousand, five hundred thirty-six".