687559072 has 12 divisors (see below), whose sum is σ = 1353631986. Its totient is φ = 343779520.

The previous prime is 687559027. The next prime is 687559073. The reversal of 687559072 is 270955786.

It can be written as a sum of positive squares in only one way, i.e., 663783696 + 23775376 = 25764^2 + 4876^2 .

It is not an unprimeable number, because it can be changed into a prime (687559073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10743079 + ... + 10743142.

Almost surely, 2^687559072 is an apocalyptic number.

It is an amenable number.

687559072 is a deficient number, since it is larger than the sum of its proper divisors (666072914).

687559072 is a wasteful number, since it uses less digits than its factorization.

687559072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21486231 (or 21486223 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 49.

The square root of 687559072 is about 26221.3476388991. The cubic root of 687559072 is about 882.6123612575.

The spelling of 687559072 in words is "six hundred eighty-seven million, five hundred fifty-nine thousand, seventy-two".