684808967 has 4 divisors (see below), whose sum is σ = 684893976. Its totient is φ = 684723960.

The previous prime is 684808951. The next prime is 684808973. The reversal of 684808967 is 769808486.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 684808967 - 2⁴ = 684808951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684808907) 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, 28988 + ... + 47009.

It is an arithmetic number, because the mean of its divisors is an integer number (171223494).

Almost surely, 2^684808967 is an apocalyptic number.

684808967 is a deficient number, since it is larger than the sum of its proper divisors (85009).

684808967 is an equidigital number, since it uses as much as digits as its factorization.

684808967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85008.

The product of its (nonzero) digits is 4644864, while the sum is 56.

The square root of 684808967 is about 26168.8549042559. The cubic root of 684808967 is about 881.4340285190.

The spelling of 684808967 in words is "six hundred eighty-four million, eight hundred eight thousand, nine hundred sixty-seven".