687491072 has 24 divisors (see below), whose sum is σ = 1374650550. Its totient is φ = 343744512.

The previous prime is 687491059. The next prime is 687491093. The reversal of 687491072 is 270194786.

It can be written as a sum of positive squares in only one way, i.e., 660284416 + 27206656 = 25696^2 + 5216^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165797 + ... + 169892.

Almost surely, 2^687491072 is an apocalyptic number.

It is an amenable number.

687491072 is a deficient number, since it is larger than the sum of its proper divisors (687159478).

687491072 is an equidigital number, since it uses as much as digits as its factorization.

687491072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335711 (or 335691 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 687491072 is about 26220.0509534211. The cubic root of 687491072 is about 882.5832633362.

The spelling of 687491072 in words is "six hundred eighty-seven million, four hundred ninety-one thousand, seventy-two".