687606786 has 32 divisors (see below), whose sum is σ = 1617900480. Its totient is φ = 215719488.

The previous prime is 687606767. The next prime is 687606793.

687606786 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373596 + ... + 375431.

It is an arithmetic number, because the mean of its divisors is an integer number (50559390).

Almost surely, 2^687606786 is an apocalyptic number.

687606786 is an abundant number, since it is smaller than the sum of its proper divisors (930293694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687606786 is a wasteful number, since it uses less digits than its factorization.

687606786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749055 (or 749049 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 54.

The square root of 687606786 is about 26222.2574543078. The cubic root of 687606786 is about 882.6327774388.

The spelling of 687606786 in words is "six hundred eighty-seven million, six hundred six thousand, seven hundred eighty-six".