681896787 has 16 divisors (see below), whose sum is σ = 1068146688. Its totient is φ = 381480480.

The previous prime is 681896779. The next prime is 681896797. The reversal of 681896787 is 787698186.

681896787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 681896787 - 2³ = 681896779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 681896787.

It is not an unprimeable number, because it can be changed into a prime (681896767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 794323 + ... + 795180.

It is an arithmetic number, because the mean of its divisors is an integer number (66759168).

Almost surely, 2^681896787 is an apocalyptic number.

681896787 is a deficient number, since it is larger than the sum of its proper divisors (386249901).

681896787 is a wasteful number, since it uses less digits than its factorization.

681896787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1589530.

The product of its digits is 8128512, while the sum is 60.

The square root of 681896787 is about 26113.1535246128. The cubic root of 681896787 is about 880.1828076656.

The spelling of 681896787 in words is "six hundred eighty-one million, eight hundred ninety-six thousand, seven hundred eighty-seven".