687215012 has 24 divisors (see below), whose sum is σ = 1339873920. Its totient is φ = 305723360.

The previous prime is 687215003. The next prime is 687215029. The reversal of 687215012 is 210512786.

It is a self number, because there is not a number n which added to its sum of digits gives 687215012.

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, 164087 + ... + 168222.

It is an arithmetic number, because the mean of its divisors is an integer number (55828080).

Almost surely, 2^687215012 is an apocalyptic number.

It is an amenable number.

687215012 is a deficient number, since it is larger than the sum of its proper divisors (652658908).

687215012 is a wasteful number, since it uses less digits than its factorization.

687215012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332371 (or 332369 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 687215012 is about 26214.7861330204. The cubic root of 687215012 is about 882.4651146239.

Adding to 687215012 its reverse (210512786), we get a palindrome (897727798).

The spelling of 687215012 in words is "six hundred eighty-seven million, two hundred fifteen thousand, twelve".