681787768 has 8 divisors (see below), whose sum is σ = 1278352080. Its totient is φ = 340893880.

The previous prime is 681787753. The next prime is 681787783. The reversal of 681787768 is 867787186.

It is an interprime number because it is at equal distance from previous prime (681787753) and next prime (681787783).

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42611728 + ... + 42611743.

It is an arithmetic number, because the mean of its divisors is an integer number (159794010).

Almost surely, 2^681787768 is an apocalyptic number.

It is an amenable number.

681787768 is a deficient number, since it is larger than the sum of its proper divisors (596564312).

681787768 is a wasteful number, since it uses less digits than its factorization.

681787768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85223477 (or 85223473 counting only the distinct ones).

The product of its digits is 6322176, while the sum is 58.

The square root of 681787768 is about 26111.0660065804. The cubic root of 681787768 is about 880.1358984336.

The spelling of 681787768 in words is "six hundred eighty-one million, seven hundred eighty-seven thousand, seven hundred sixty-eight".