687284545 has 8 divisors (see below), whose sum is σ = 824938920. Its totient is φ = 549696000.

The previous prime is 687284537. The next prime is 687284573. The reversal of 687284545 is 545482786.

It can be written as a sum of positive squares in 4 ways, for example, as 331094416 + 356190129 = 18196^2 + 18873^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 687284545 - 2³ = 687284537 is a prime.

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, 10545 + ... + 38545.

It is an arithmetic number, because the mean of its divisors is an integer number (103117365).

Almost surely, 2^687284545 is an apocalyptic number.

It is an amenable number.

687284545 is a deficient number, since it is larger than the sum of its proper divisors (137654375).

687284545 is a wasteful number, since it uses less digits than its factorization.

687284545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32915.

The product of its digits is 2150400, while the sum is 49.

The square root of 687284545 is about 26216.1123166651. The cubic root of 687284545 is about 882.4948764773.

The spelling of 687284545 in words is "six hundred eighty-seven million, two hundred eighty-four thousand, five hundred forty-five".