681207786 has 32 divisors (see below), whose sum is σ = 1730052480. Its totient is φ = 194630688.

The previous prime is 681207773. The next prime is 681207823. The reversal of 681207786 is 687702186.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 900691 + ... + 901446.

It is an arithmetic number, because the mean of its divisors is an integer number (54064140).

Almost surely, 2^681207786 is an apocalyptic number.

681207786 is an abundant number, since it is smaller than the sum of its proper divisors (1048844694).

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

681207786 is a wasteful number, since it uses less digits than its factorization.

681207786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802155 (or 1802149 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 681207786 is about 26099.9575861724. The cubic root of 681207786 is about 879.8862568210.

The spelling of 681207786 in words is "six hundred eighty-one million, two hundred seven thousand, seven hundred eighty-six".