684742089 has 4 divisors (see below), whose sum is σ = 912989456. Its totient is φ = 456494724.

The previous prime is 684742087. The next prime is 684742111. The reversal of 684742089 is 980247486.

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 not a de Polignac number, because 684742089 - 2¹ = 684742087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684742087) 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, 114123679 + ... + 114123684.

It is an arithmetic number, because the mean of its divisors is an integer number (228247364).

Almost surely, 2^684742089 is an apocalyptic number.

It is an amenable number.

684742089 is a deficient number, since it is larger than the sum of its proper divisors (228247367).

684742089 is a wasteful number, since it uses less digits than its factorization.

684742089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228247366.

The product of its (nonzero) digits is 774144, while the sum is 48.

The square root of 684742089 is about 26167.5770563497. The cubic root of 684742089 is about 881.4053341595.

The spelling of 684742089 in words is "six hundred eighty-four million, seven hundred forty-two thousand, eighty-nine".