684561073 has 4 divisors (see below), whose sum is σ = 782355520. Its totient is φ = 586766628.

The previous prime is 684561061. The next prime is 684561079. The reversal of 684561073 is 370165486.

It is a happy number.

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 684561073 - 2²⁹ = 147690161 is a prime.

It is a super-2 number, since 2×684561073² = 937247725333822658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684561079) 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, 48897213 + ... + 48897226.

It is an arithmetic number, because the mean of its divisors is an integer number (195588880).

Almost surely, 2^684561073 is an apocalyptic number.

It is an amenable number.

684561073 is a deficient number, since it is larger than the sum of its proper divisors (97794447).

684561073 is an equidigital number, since it uses as much as digits as its factorization.

684561073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97794446.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 684561073 is about 26164.1180436108. The cubic root of 684561073 is about 881.3276589141.

The spelling of 684561073 in words is "six hundred eighty-four million, five hundred sixty-one thousand, seventy-three".