681862442 has 16 divisors (see below), whose sum is σ = 1065177000. Its totient is φ = 326961600.

The previous prime is 681862429. The next prime is 681862457. The reversal of 681862442 is 244268186.

It can be written as a sum of positive squares in 4 ways, for example, as 407595721 + 274266721 = 20189^2 + 16561^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 681862442.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30809 + ... + 48092.

Almost surely, 2^681862442 is an apocalyptic number.

681862442 is a deficient number, since it is larger than the sum of its proper divisors (383314558).

681862442 is a wasteful number, since it uses less digits than its factorization.

681862442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79081.

The product of its digits is 147456, while the sum is 41.

The square root of 681862442 is about 26112.4958975583. The cubic root of 681862442 is about 880.1680300694.

The spelling of 681862442 in words is "six hundred eighty-one million, eight hundred sixty-two thousand, four hundred forty-two".