684857461 has 8 divisors (see below), whose sum is σ = 727657560. Its totient is φ = 644567104.

The previous prime is 684857429. The next prime is 684857471. The reversal of 684857461 is 164758486.

It can be written as a sum of positive squares in 4 ways, for example, as 55800900 + 629056561 = 7470^2 + 25081^2 .

It is not a de Polignac number, because 684857461 - 2⁵ = 684857429 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 (684857471) 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 7 ways as a sum of consecutive naturals, for example, 64786 + ... + 74611.

It is an arithmetic number, because the mean of its divisors is an integer number (90957195).

Almost surely, 2^684857461 is an apocalyptic number.

It is an amenable number.

684857461 is a deficient number, since it is larger than the sum of its proper divisors (42800099).

684857461 is an equidigital number, since it uses as much as digits as its factorization.

684857461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139448 (or 139414 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 49.

The square root of 684857461 is about 26169.7814473106. The cubic root of 684857461 is about 881.4548339576.

The spelling of 684857461 in words is "six hundred eighty-four million, eight hundred fifty-seven thousand, four hundred sixty-one".