681828458 has 4 divisors (see below), whose sum is σ = 1022742690. Its totient is φ = 340914228.

The previous prime is 681828457. The next prime is 681828487. The reversal of 681828458 is 854828186.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 681575449 + 253009 = 26107^2 + 503^2 .

It is a super-2 number, since 2×681828458² = 929780092277315528, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (681828457) 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 as a sum of consecutive naturals, namely, 170457113 + ... + 170457116.

Almost surely, 2^681828458 is an apocalyptic number.

681828458 is a deficient number, since it is larger than the sum of its proper divisors (340914232).

681828458 is a wasteful number, since it uses less digits than its factorization.

681828458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340914231.

The product of its digits is 983040, while the sum is 50.

The square root of 681828458 is about 26111.8451665140. The cubic root of 681828458 is about 880.1534073120.

It can be divided in two parts, 681828 and 458, that added together give a palindrome (682286).

The spelling of 681828458 in words is "six hundred eighty-one million, eight hundred twenty-eight thousand, four hundred fifty-eight".