687597795786 has 64 divisors (see below), whose sum is σ = 1544088655872. Its totient is φ = 202317360000.

The previous prime is 687597795779. The next prime is 687597795791.

It is a happy number.

687597795786 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 687597795699 and 687597795708.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31170 + ... + 1173101.

It is an arithmetic number, because the mean of its divisors is an integer number (24126385248).

Almost surely, 2^687597795786 is an apocalyptic number.

687597795786 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 687597795786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (772044327936).

687597795786 is an abundant number, since it is smaller than the sum of its proper divisors (856490860086).

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

687597795786 is a wasteful number, since it uses less digits than its factorization.

687597795786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1204539.

The product of its digits is 11202105600, while the sum is 84.

The spelling of 687597795786 in words is "six hundred eighty-seven billion, five hundred ninety-seven million, seven hundred ninety-five thousand, seven hundred eighty-six".