684067899 has 4 divisors (see below), whose sum is σ = 912090536. Its totient is φ = 456045264.

The previous prime is 684067861. The next prime is 684067907. The reversal of 684067899 is 998760486.

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

It is not a de Polignac number, because 684067899 - 2¹³ = 684059707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684067099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114011314 + ... + 114011319.

It is an arithmetic number, because the mean of its divisors is an integer number (228022634).

Almost surely, 2^684067899 is an apocalyptic number.

684067899 is a deficient number, since it is larger than the sum of its proper divisors (228022637).

684067899 is a wasteful number, since it uses less digits than its factorization.

684067899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228022636.

The product of its (nonzero) digits is 5225472, while the sum is 57.

The square root of 684067899 is about 26154.6917206072. The cubic root of 684067899 is about 881.1159649676.

The spelling of 684067899 in words is "six hundred eighty-four million, sixty-seven thousand, eight hundred ninety-nine".