681323450 has 24 divisors (see below), whose sum is σ = 1341808092. Its totient is φ = 256497920.

The previous prime is 681323437. The next prime is 681323459. The reversal of 681323450 is 54323186.

681323450 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 521528569 + 159794881 = 22837^2 + 12641^2 .

It is not an unprimeable number, because it can be changed into a prime (681323459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 399929 + ... + 401628.

Almost surely, 2^681323450 is an apocalyptic number.

681323450 is a deficient number, since it is larger than the sum of its proper divisors (660484642).

681323450 is a wasteful number, since it uses less digits than its factorization.

681323450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801586 (or 801581 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 681323450 is about 26102.1732811657. The cubic root of 681323450 is about 879.9360533767.

The spelling of 681323450 in words is "six hundred eighty-one million, three hundred twenty-three thousand, four hundred fifty".