686878481 has 4 divisors (see below), whose sum is σ = 723030000. Its totient is φ = 650726964.

The previous prime is 686878459. The next prime is 686878537. The reversal of 686878481 is 184878686.

686878481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686878481 is a prime.

It is a super-2 number, since 2×686878481² = 943604095321734722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686878441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18075731 + ... + 18075768.

It is an arithmetic number, because the mean of its divisors is an integer number (180757500).

Almost surely, 2^686878481 is an apocalyptic number.

It is an amenable number.

686878481 is a deficient number, since it is larger than the sum of its proper divisors (36151519).

686878481 is a wasteful number, since it uses less digits than its factorization.

686878481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36151518.

The product of its digits is 4128768, while the sum is 56.

The square root of 686878481 is about 26208.3666221304. The cubic root of 686878481 is about 882.3210426074.

The spelling of 686878481 in words is "six hundred eighty-six million, eight hundred seventy-eight thousand, four hundred eighty-one".