685428481 has 4 divisors (see below), whose sum is σ = 692494852. Its totient is φ = 678362112.

The previous prime is 685428461. The next prime is 685428487. The reversal of 685428481 is 184824586.

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 429940225 + 255488256 = 20735^2 + 15984^2 .

It is a cyclic number.

It is not a de Polignac number, because 685428481 - 2⁹ = 685427969 is a prime.

It is a super-2 number, since 2×685428481² = 939624405131934722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685428487) 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, 3533040 + ... + 3533233.

It is an arithmetic number, because the mean of its divisors is an integer number (173123713).

Almost surely, 2^685428481 is an apocalyptic number.

It is an amenable number.

685428481 is a deficient number, since it is larger than the sum of its proper divisors (7066371).

685428481 is an equidigital number, since it uses as much as digits as its factorization.

685428481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7066370.

The product of its digits is 491520, while the sum is 46.

The square root of 685428481 is about 26180.6890856601. The cubic root of 685428481 is about 881.6997455119.

The spelling of 685428481 in words is "six hundred eighty-five million, four hundred twenty-eight thousand, four hundred eighty-one".