687444786 has 64 divisors (see below), whose sum is σ = 1788514560. Its totient is φ = 191617920.

The previous prime is 687444781. The next prime is 687444787.

687444786 is nontrivially palindromic in base 10.

687444786 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (687444781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6681 + ... + 37676.

It is an arithmetic number, because the mean of its divisors is an integer number (27945540).

Almost surely, 2^687444786 is an apocalyptic number.

687444786 is an abundant number, since it is smaller than the sum of its proper divisors (1101069774).

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

687444786 is a wasteful number, since it uses less digits than its factorization.

687444786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44416 (or 44410 counting only the distinct ones).

The product of its digits is 7225344, while the sum is 54.

The square root of 687444786 is about 26219.1682934452. The cubic root of 687444786 is about 882.5634559683.

The spelling of 687444786 in words is "six hundred eighty-seven million, four hundred forty-four thousand, seven hundred eighty-six".