681894747 has 8 divisors (see below), whose sum is σ = 1010214480. Its totient is φ = 454596480.

The previous prime is 681894713. The next prime is 681894751. The reversal of 681894747 is 747498186.

It is a happy number.

681894747 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 681894747 - 2⁸ = 681894491 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681894693 and 681894702.

It is not an unprimeable number, because it can be changed into a prime (681894757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12627654 + ... + 12627707.

It is an arithmetic number, because the mean of its divisors is an integer number (126276810).

Almost surely, 2^681894747 is an apocalyptic number.

681894747 is a deficient number, since it is larger than the sum of its proper divisors (328319733).

681894747 is a wasteful number, since it uses less digits than its factorization.

681894747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25255370 (or 25255364 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 681894747 is about 26113.1144638092. The cubic root of 681894747 is about 880.1819299302.

The spelling of 681894747 in words is "six hundred eighty-one million, eight hundred ninety-four thousand, seven hundred forty-seven".