687729506 has 8 divisors (see below), whose sum is σ = 1035319260. Its totient is φ = 342623088.

The previous prime is 687729499. The next prime is 687729517. The reversal of 687729506 is 605927786.

It can be written as a sum of positive squares in 2 ways, for example, as 607178881 + 80550625 = 24641^2 + 8975^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620141 + ... + 621248.

Almost surely, 2^687729506 is an apocalyptic number.

687729506 is a deficient number, since it is larger than the sum of its proper divisors (347589754).

687729506 is a wasteful number, since it uses less digits than its factorization.

687729506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241668.

The product of its (nonzero) digits is 1270080, while the sum is 50.

The square root of 687729506 is about 26224.5973467659. The cubic root of 687729506 is about 882.6852833445.

The spelling of 687729506 in words is "six hundred eighty-seven million, seven hundred twenty-nine thousand, five hundred six".