684457457 has 4 divisors (see below), whose sum is σ = 684701556. Its totient is φ = 684213360.

The previous prime is 684457439. The next prime is 684457471. The reversal of 684457457 is 754754486.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25816561 + 658640896 = 5081^2 + 25664^2 .

It is a cyclic number.

It is not a de Polignac number, because 684457457 - 2⁸ = 684457201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684457427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117794 + ... + 123467.

It is an arithmetic number, because the mean of its divisors is an integer number (171175389).

Almost surely, 2^684457457 is an apocalyptic number.

It is an amenable number.

684457457 is a deficient number, since it is larger than the sum of its proper divisors (244099).

684457457 is a wasteful number, since it uses less digits than its factorization.

684457457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244098.

The product of its digits is 3763200, while the sum is 50.

The square root of 684457457 is about 26162.1378522475. The cubic root of 684457457 is about 881.2831903936.

The spelling of 684457457 in words is "six hundred eighty-four million, four hundred fifty-seven thousand, four hundred fifty-seven".