681334400 has 48 divisors (see below), whose sum is σ = 1683116790. Its totient is φ = 272532480.

The previous prime is 681334397. The next prime is 681334421. The reversal of 681334400 is 4433186.

It can be written as a sum of positive squares in 3 ways, for example, as 332989504 + 348344896 = 18248^2 + 18664^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103259 + ... + 109658.

Almost surely, 2^681334400 is an apocalyptic number.

It is an amenable number.

681334400 is an abundant number, since it is smaller than the sum of its proper divisors (1001782390).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681334400 is a wasteful number, since it uses less digits than its factorization.

681334400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212941 (or 212924 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 681334400 is about 26102.3830329723. The cubic root of 681334400 is about 879.9407673630.

Adding to 681334400 its reverse (4433186), we get a palindrome (685767586).

The spelling of 681334400 in words is "six hundred eighty-one million, three hundred thirty-four thousand, four hundred".